Negative Blood Type Research Articles

Prevalence of Rhesus D negativity and barriers to immuno- prophylaxis among obstetric patients in Kitengela Sub- county Hospital: A cross-sectional study

Background: Rhesus (Rh) alloimmunization is a serious but preventable disease that develops in women who are Rh(D)-negative. This disease contributes significantly to perinatal morbidity and mortality. Prevalence data of Rh(D)-negative blood type among pregnant women in Kenya are scarce. This study aimed to determine the prevalence of Rh(D)-negative blood type, barriers to immunoprophylaxis, and ABO blood type patterns among the obstetric population in Kitengela Subcounty Hospital, Kajiado, Kenya. Methods: A cross-sectional study design was employed in which medical records of Rh-negative women as documented at the first antenatal visit were retrieved. Data were collected, extracted into a data collection tool, and analyzed using the Statistical Package for Social Scientists Software (SPSS version 23). Results: Of the 7141 women screened, 1.2 % (85) were Rh-negative. Among these, blood group O was the most common (48.2%), followed by blood groups B (24.7%), A (23.5%), and AB (3.5%). Most Rh-negative women (45.9%) were aged 15-23 years. Following delivery, only half of the women received anti-D immunoglobulin. Among those who did not receive anti-D postnatally, 80.8% lacked a documented reason, whereas 12.2% and 4.9% of the patients lacked access and did not know their Rh status, respectively. None of these patients had fetal blood grouping conducted before anti-D administration. Conclusion: Rh(D) negativity remains prevalent in the Kenyan population. However, access restrictions at both diagnostic and therapeutic levels remain. In addition, there is an overt hiatus in neonatal blood grouping.

Generation of a human iPSC cell line (MUSIi017-A) from a donor with O negative blood type

The Rh-negative type O blood group (O Rh-) is considered a universal donor for emergency blood transfusions. Due to the constant shortage of this rare blood group, the production of blood cells from iPSCs derived from the O Rh- donor could potentially serve as a limitless blood source for transfusions. In this report, we establish a MUSIi017-A iPSC line from peripheral blood mononuclear cells of a healthy donor with the O Rh- blood group. The established iPSC line exhibited a normal karyotype, showed identical STR compared to donor peripheral blood mononuclear cells, and could differentiate to all three germ layers.

Prevalence and association of early onset severe hyperbilirubinemia in newborn in the East China region: Retrospective medical record analyses.

Research on the prevalence and association of hyperbilirubinemia is controversial because of different cultures, demographics, and clinical conditions. The etiology of hyperbilirubinemia is affected by the environment and other factors in the newborn. The World Health Organization recommended a 1-day hospital stay after uncomplicated delivery, jaundice assessment before discharge, and screening on 3rd and 7th days after birth for hyperbilirubinemia. However, the implementation of these recommendations is difficult in China. The objective of this study was to evaluate the prevalence and association of early onset severe hyperbilirubinemia in newborns in East China. Retrospective medical record analyses for 250 cesarean sections or vaginal deliveries, ≥2 kg body weight, and negative for Hepatitis B surface antigen by birth newborns were performed. A biochemical analyzer, quantitative assay, and quantitative polymerase chain reaction were used to evaluate total serum bilirubin, glucose-6-phosphate dehydrogenase (G6PD) deficiency, and gene variant phenotyping, respectively. A total in 33 (13%) newborns were reported with early onset severe hyperbilirubinemia (according to the American Academy of Pediatrics, total serum bilirubin ≥ 342 μmol/L within 6 hours of birth). All newborns with severe hyperbilirubinemia were hospitalized and underwent phototherapy. The mothers of all newborns had a gestational age ≥ 35 weeks. Hospitalization included artificial feeding, and breastfeeding was rare (P < .0001). ABO incompatibility ("O" blood type for mother and either "A" or "AB" or "B" blood type for newborn, P = .0411), G6PD deficiency (G6PD/6-phosphogluconate dehydrogenase ≤ 1.0 in quantitative assay, P = .0422), Rh incompatibility (the mother's blood type was Rh negative and newborn blood type was Rh positive, P = .0416), fewer genotype rs4149056 frequencies (P = .0452), higher genotype rs2306283 frequencies (P = .0461), and higher genotype rs1805173 frequencies (P = .0471) were independent parameter for early onset severe hyperbilirubinemia of newborns. The prevalence of early onset severe hyperbilirubinemia in Chinese newborns is 13% in the East China region. Blood incompatibility, G6PD deficiency, fewer genotype rs4149056 frequencies, higher genotype rs2306283 frequencies, and higher genotype rs1805173 frequencies were independent predictors of early onset severe hyperbilirubinemia among newborns in the East China region (Level of Evidence: IV; Technical Efficacy: Stage 5).

#5 : Associated Factors with Premenstrual Syndrome and Premenstrual Dysphoric Disorder Among Female Medical Students: A Cross-Sectional Study

Background and Aims: Premenstrual syndrome (PMS) and Premenstrual dysphoric disorder (PMDD) are two premenstrual disorders that have been reported in many countries and have gradually become predominant concerns The study aimed to determine potential risk factors associated with PMS and PMDD Method: Three hundred two female student participants who were 18 – 45 years old completed a questionnaire including demographic characteristics, lifestyle factors, and a Vietnamese Premenstrual Syndrome Screening Tool (PSST). We then followed up participants during at least two menstrual cycles using the Daily Record of Severity of Problems (DRSP). The PMS and PMDD diagnosis were established using The Carolina Premenstrual Assessment Scoring System (C-PASS), based on the American College of Obstetrics and Gynecology (ACOG) and Diagnostic and Statistical Manual of Mental Disorders (DSM-5). Results: According to the C-PASS, 35 out of 302 students (11.6%; 95%CI: 8.2-15.7%) met the diagnosis of PMS (31 students) or PMDD (4 students). We found that age at menarche (PR = 0.77, 95%CI: 0.63 - 0.96), having negative Rh blood type (PR=4.43, 95%CI: 1.95 to 10.08), being moderately depressed or higher (PR=2.81, 95%CI: 1.24 to 6.36), and consuming caffeine more than three times per week were statistically associated with having PMS/PMDD after adjusting for other variables. Conclusion: The prominent risk factors for PMS and PMDD were negative Rhesus blood type, menarche age, caffeine consumption, and self-reported depression.

270. RhD negative Blood Type is Associated with Higher Levels of Babesia microti Parasitemia and May Be a Useful Point-of-Care Biomarker in Human Babesiosis

Abstract Background There is a growing need to identify novel point-of-care biomarkers that correlate with clinical presentation in the study of babesiosis. Recently, Jajosky et al (2023, PMID: 36696414) demonstrated that in patients with babesiosis, lack of expression of Rhesus (RhD) factor antigen was associated with elevated levels of parasitemia, a potential risk factor for severe disease. The goal of this study is to add to these findings by analyzing a babesiosis cohort with varying ABO and RhD factor antigens and assessing for any correlation with increased disease severity. Methods A total of 52 cases of confirmed babesiosis at Stony Brook University Hospital from 2008 to 2014 were reviewed. Maximum parasitemia (Mp), hospital length of stay (LoS), Intensive Care Unit (ICU) admission, and need for blood transfusion or exchange transfusion (XT) were compared amongst patients with varying ABO and RhD antigen status. Mp and LoS were compared among ABO and RhD groups with Analysis of Variance (ANOVA) after log transformation. Logistic regression was used to compare rates of ICU admission and XT among groups. Fisher’s exact test was used to assess requirement for RBC transfusion between RhD groups. Results Patient characteristics and clinical information were recorded (Table 1). There was no significant difference in LoS, ICU admission, or XT among ABO groups (P = 0.43, P = 0.76, P = 0.10, Table 2) and among RhD groups (P = 0.094, P =0.28, P = 0.72, Table 2). While no difference was seen in Mp among ABO groups (P = 0.58, Fig1A), RhD- patients were more likely to have a higher Mp when compared to RhD+ patients (median of 6.7% vs 1.6%; P = 0.036, Fig 1B, Table 2). RhD- patients had greater requirement for blood transfusions compared to RhD+ patients (P = 0.03, Table 2). Table 1 Summary of patient demographics and clinical data among RhD groups versus total sample population. Table 2 Analysis of Maximum parasitemia, hospital length of stay (LoS), Intensive Care Unit (ICU) admission, and need for blood transfusion or exchange transfusion among ABO/RhD groups. Figure 1 (A)Box plot analysis of median maximum parasitemia (Mp) among ABO groups. Blood type A had the highest Mp at 4.2% with an interquartile range of 10.1%. Blood type B had the lowest Mp at 1.2% with an interquartile range of 5.9%. Only one patient had blood type AB with a median Mp of 2.6%. Blood type O had a median Mp of 2.1% with an interquartile range of 4.1%. There was no statistically significant difference in Mp among ABO groups (P = 0.58, table 2). (B) Box plot analysis of median Mp among RhD groups. RhD- had the highest median Mp at 6.7% with an interquartile range of 22.9%. RhD+ had the lowest median Mp at 1.6% with an interquartile range of 4.9%. There was a statistically significant difference in Mp among RhD groups (P = 0.036, table 2). Conclusion Our study suggests that RhD- patients may be at increased risk of severe babesiosis due to the greater parasite burden. Although there were no differences in LoS or ICU admission, the RhD- patients received more blood transfusions. Our findings support those of Jajosky et al and suggest that further studies should evaluate the potential of RBC antigens to impact the clinical course of babesiosis. Disclosures All Authors: No reported disclosures

Occurrence of anti D alloantibodies among weak D and D negative patients.

Objective: To estimate the frequency of anti-D alloantibodies in patients with weak or negative D. Study Design: Cross-sectional study. Setting: Under CIP/IRB/1111 in the Blood Bank of CHUGHTAI Institute of Pathology. Period: May 2022 to October 2022. Material &amp; Methods: Patients who booked their blood group testing at this laboratory were tested for their ABO RH blood type. The EDTA and yellow top serum samples were taken from patients. Blood group was identified using tube method. Patients with Rh-D negative blood type and weak D were included in this study. Those patients were screened for alloantibodies by screening cell (Bio-Rad), and those patients whose screening came out positive were tested for antibody identification using an extended 11cell panel (Bio-Rad). The Statistics calculator was used to determine the sample size. Software SPSS version 23 was used to conduct all statistical analyses. Results: 14103 blood groups were tested. The age of patients on average was 51±22 years. The males and females were 44% and 56%, respectively. Out of n=14103, 9.5% came out Rh-negative blood type. The blood group distribution was as follows, B negative 46% O negative 23% A negative 20% AB negative 11%, and weak D 0.02% only. Total 7.1% participants with negative RH-D blood type had Rh alloantibodies detected. Patients with weak D had no Rh alloantibody. Conclusion: Blood group O RH-D negative was the most prevalent with positive anti D-alloantibodies. Prevalence of positive antibody was 7.1%.

Associated factors with Premenstrual syndrome and Premenstrual dysphoric disorder among female medical students: A cross-sectional study.

The study aimed to determine potential risk factors associated with Premenstrual Syndrome and Premenstrual Dysphoric Disorder. Three hundred two female student participants who were 18-45 years old completed a questionnaire including demographic characteristics, lifestyle factors, and a Vietnamese Premenstrual Syndrome Screening Tool. We then followed up participants during at least two menstrual cycles using the Daily Record of Severity of Problems. The Premenstrual Syndrome and Premenstrual Dysphoric Disorder diagnosis was established using The Carolina Premenstrual Assessment Scoring System, based on the American College of Obstetrics and Gynecology and Diagnostic and Statistical Manual of Mental Disorders. According to the Carolina Premenstrual Assessment Scoring System, 35 out of 302 students (11.6%; 95%CI: 8.2-15.7%) met the diagnosis of PMS (31 students) or PMDD (4 students). We found that age at menarche (PR = 0.77, 95%CI: 0.63-0.96), having negative Rh blood type (PR = 4.43, 95%CI: 1.95 to 10.08), being moderately depressed or higher (PR = 2.81, 95%CI: 1.24 to 6.36), and consuming caffeine more than three times per week were statistically associated with having Premenstrual Syndrome or Premenstrual Dysphoric Disorder after adjusting for other variables. The prominent risk factors for Premenstrual Syndrome and Premenstrual Dysphoric Disorder were negative Rhesus blood type, menarche age, caffeine consumption, and self-reported depression.

Association between ABO blood group and COVID-19-positive patients in institutional-based hospital, Coimbatore – A cross-sectional study

Objective: The novel coronavirus disease (COVID-19) has spread globally and caused 6.5 million death as of October 2022. Risk factors for COVID-19 morbidity and mortality include age, sex, smoking, hypertension, cardiovascular disorders, respiratory disease, and diabetes mellitus. Association between ABO blood groups and number of other infections or disease severity following infections such as SARS-COV-1 and hepatitis B virus has been reported. Rh(D) phenotype (positive and negative Rh blood types) is associated with very few diseases compared to ABO blood group. Various articles have reported the association of ABO blood group and COVID-19. Our aim was to investigate if any association exists in between ABO blood group with Rh phenotype and COVID-19 infection in Coimbatore and with the result an awareness among the public should be created to hasten the preventive measure from further encounter of the infection and help the government in taking a proactive approach to fight COVID-19 in the area. Thus, we conducted a study to find out the association between ABO blood group and COVID-19-positive (SARS-COV-2) patients in institutional-based hospital – Coimbatore which was one of the most affected districts in Tamil Nadu. Materials and Methods: This is a single-center, retrospective, observational, and cross-sectional study conducted in a private institutional-based hospital in Coimbatore. The data were collected from around 437 patients’ medical records, who were tested COVID-19-positive between October 2020 and November 2021 whose blood grouping was available as part of investigation. Data were analyzed statistically to correlate the association of ABO blood group, Rh phenotype, and COVID-19 infection. Results: In 437 COVID-19-infected patients, the ABO blood group displayed a percentage distribution for A, B, AB, and O at 19% (83), 35% (153), 8.5% (37), and 37.5% (164), respectively and 409 (93.6%) were Rh +ve. Among the patients, blood group O 164 (37.5%), followed by blood group B153 (35%) is observed to be significantly associated with COVID-19 susceptibility, whereas blood group A83 (19%) and AB 37(8.5%) showed lower susceptibility for COVID-19 infection. Conclusion: This study did not show any statistically significant association of ABO blood group and Rh phenotype seen in relation to COVID-19 infection.

Exemplification of ABO Blood Groups in Patients with Diabetes Mellitus

INTRODUCTION: Diabetes Mellitus and blood groups are interrelated. The relationship between ABO blood groups and disease susceptibility has generated a concern. The identification of a positive relationship between DM and blood groups could indicate higher susceptibility to diabetes and a negative relationship could indicate protection from diabetes. Therefore, the objective of the study was designed to exemplify ABO blood groups in Patients with Diabetes Mellitus. MATERIALS AND METHODS: The study was conducted at Ram Janaki Hospital and Swastika Health Care Hospital, Janakpurdham from September 2017 to March 2018.The record of the patients from the medicine OPD in both the hospitals was identified and relevant data were extracted. The data was recorded from the reports of the patients with confirmed DM patients attending Medicine department. RESULTS: The majority of the 579 diabetic patients were in the 40-60 year old age group. The most predominant blood group was B (251; 43.4 %), followed by AB (137; 23.7 %), O (125; 21.5 %), and A (66; 11.4 %) respectively. In comparison to male diabetics, less than half (44.1%) of female diabetics had blood group B. (42.7%). Similarly, males (13.0 %) were found to have more blood group A than females (9.8%). In diabetic individuals, the relationship between blood group and age (p=0.652) and sex (p=0.659) was shown to be insignificant. The majority of the patients (94.3%) had Rh positive blood groups, whereas the other had Rh negative blood types (5.7%). There was no correlation between blood group Rh factor and age group (p=0.817) or as well as with sex (p=0.333) among diabetic patients. CONCLUSIONS: Diabetic patients were more likely to have blood type B, while diabetics were less likely to have blood group A. It implies that diabetes is linked to ABO blood types, and that those with Group-B are more likely to develop the condition. Blood group could be a risk factor, and knowing it can aid with disease evaluation and screening.

A Study on the Relationship between Blood Group and Type of Cancer

The presence and lack of blood antigens in some blood groups induce blood membrane changes, morphologically and functionally, and it is related to some kind of disease such as cancer. Structure-dependent functions of blood types can relate the blood groups to health and diseases. The study aimed to determine the association of "ABO" and "Rhesus" blood groups with the frequency of cancer. A total of 576 cancer patients participated in this study, and they were diagnosed with different types of cancer. The results showed that blood types A and O have a high rate of occurrence of breast cancer and lung cancer, the positive Rhesus blood type has a high incidence of breast cancer. Meanwhile, the Rhesus negative blood type has a high incidence of stomach cancer. In conclusion, this study supports previous studies about the relationship between the blood group type and the probability of cancers occurring.

Transient congenital hyperinsulinism and hemolytic disease of a newborn despite rhesus D prophylaxis: a case report

BackgroundIn neonates, rhesus D alloimmunization despite anti-D immunoglobulin prophylaxis is rare and often unexplained. Rhesus D alloimmunization can lead to hemolytic disease of the newborn with anemia and unconjugated hyperbilirubinemia. In past reports, transient congenital hyperinsulinism has been described as a rare complication of rhesus D alloimmunization. Our case report illustrates that rhesus D alloimmunization can result in a pseudosyndrome with severe congenital hyperinsulinism, anemia, and conjugated hyperbilirubinemia, despite correctly administered anti-D immunoglobulin prophylaxis.Case presentationWe report of a 36-year-old, Caucasian gravida 1, para 1 mother with A RhD negative blood type who received routine antenatal anti-D immunoglobulin prophylaxis. Her full term newborn boy presented with severe congenital hyperinsulinism, anemia, and conjugated hyperbilirubinemia up to 295 µmol/L (ref. < 9), accounting for 64% of the total bilirubin. Syndromic congenital hyperinsulinism was suspected. Examinations showed a positive direct antiglobulin test, initially interpreted as caused by irregular antibodies; diffuse congenital hyperinsulinism by 18F-DOPA positron emission tomography/computed tomography scan; normal genetic analyses for congenital hyperinsulinism; mildly elevated liver enzymes; delayed, but present bile excretion by Tc99m-hepatobiliary iminodiacetic acid scintigraphy; and cholestasis and mild fibrosis by liver biopsy. The maternal anti-D titer was 1:16,000 day 20 postpartum. Y-chromosome material in the mother’s blood could not be identified. This could, however, not exclude late intrapartum fetomaternal hemorrhage as the cause of immunization. No causative genetic findings were deetrmined by trio whole exome sequencing. The child went into clinical remission after 5.5 months.ConclusionOur case demonstrates that rhesus D alloimmunization may present as a pseudosyndrome with transient congenital hyperinsulinism, anemia, and inspissated bile syndrome with conjugated hyperbilirubinaemia, despite anti-D immunoglobulin prophylaxis, possibly due to late fetomaternal hemorrhage.

Association between ABO blood groups and rhesus antigen and susceptibility to COVID-19 in the Yazd hospital

Blood group antigens are one of the most important antigens in humans that have an impact on susceptibility to disease and may be used as a prognosis factor in different diseases such as COVID-19. The study aimed to investigate the relationship between ABO blood groups and Rhesus antigen and susceptibility to COVID-19. The clinical data of 398 subjects were used in the investigation collected from 148 cases vs. 250 controls. This information was obtained from Shahid Sadoughi Hospital of Yazd (IRAN) University. Blood groups and outcomes were assessed using statistical tests for four populations: COV + vs. COV− and COV +/deceased vs. COV +/live. Out of a total of 148 COVID-19 patients, 80 (54/1%) were male, 68 (45/9%) were female. Among these patients, 33 (22/6%) had type A+, 44 (30/1%) had type B+, 13 (8/9%) had type AB+, and 36 (24/7%) had type O+. On the other hand, out of 148 patients, 126 (86/3%) had positive blood types, and 20 (13/7%) had negative blood types. As a result, no significant difference was found in the relationship between ABO blood groups and RH type and susceptibility to COVID-19 (p-value = 0.392 and p-value = 0.847, respectively). Other data showed a significant difference between patients group with other parameters such as age (p-value<0.001) and gender (p-value<0.001). Although in this study there was no association between blood type and RH type with COVID-19, findings of the association between age and gender can confirm the results of previous studies.

Proportion of Unsensitized Rh(D)-Negative Pregnant Women Delivered at Siriraj Hospital Who Received a Complete Course of Anti-D Immunoglobulin: An Awareness problem?

Background: Rh(D) alloimmunization prophylaxis should be administered to unsensitized Rh(D)-negative pregnant women. A routine antenatal dose and a postpartum dose for women that delivered an Rh(D)-positive neonate are recommended. Due to a very low prevalence of Rh(D)-negative blood type in Thai population, awareness of this specific management may be lacking. Objective: To determine the proportion of unsensitized Rh(D)-negative pregnant women that delivered at Siriraj Hospital who received a complete course of anti-D immunoglobulin and to determine the factors associated with the failure to achieve a complete administration as well as pregnancy and neonatal outcomes. Materials and Methods: Medical records of 133 unsensitized Rh(D)-negative pregnant women were reviewed to determine the proportion of cases receiving a complete anti-D prophylaxis. Possible reasons for missing anti-D administration were postulated. Comparison between cases receiving and not receiving antenatal anti-D prophylaxis was performed in terms of associated factors. Pregnancy and neonatal outcomes were compared between women who received complete prophylaxis and those who did not. Results: A complete anti-D prophylaxis was obtained in 71.4% of the women with antenatal dose given to 78.2%. Late antenatal care (OR 2.6, 95% CI 1.4 to 4.9) and late or no antenatal care at Siriraj Hospital (OR 7.1, 95% CI 2.8 to 17.9) were associated with missing antenatal anti-D administration. Desire for tubal sterilization and positive maternal Rh(D)-antibody in the third trimester appeared to be the causes of postpartum dose omission. Pregnancy and neonatal outcomes were comparable between women receiving and not receiving a complete anti-D prophylaxis. Conclusion: The proportion of unsensitized Rh(D)-negative pregnant women delivering at Siriraj Hospital who received a complete anti-D prophylaxis was 71.4%. Late antenatal care, late or no antenatal care at Siriraj Hospital, desire for tubal sterilization, and positive maternal Rh(D)-antibody in the third trimester were associated with the incomplete Rh(D) alloimmunization prophylaxis. Keywords: Rh(D)-negative, Alloimmunization, Anti-D immunoglobulin, Anti-D prophylaxis, Rh immunoglobulin

Fluorescence emission quenching of RdB fluorophores in attendance of various blood type RBCs based on Stern-Volmer formalism

In this work, the optical properties of Rhodamine B (RdB) are investigated in the attendance of various red blood cells (RBCs). RdB fluorophores, as biological markers, is excited using SHG-CW Nd:YAG laser at 532 nm. In fact, the addition of biomolecules of interest to the reference fluorophore notably changes the fluorescence properties of the suspension. Here, laser induced fluorescence (LIF) spectrophotometry based on Stern-Volmer quenching formalism and field emission scanning electron microscope (FESEM) are employed here. According to the given fluorescence spectra, the spectral shift of emissions as well as quenching coefficients are assessed subsequently. The Stern-Volmer formalism is used to determine the quenching coefficients. In fact, RdB + RBCs suspensions contain a plenty of bioconjugates leading to the signal reduction and notable red shift in RdB fluorescence emissions. Furthermore, it is demonstrated that the positive blood type RBCs exhibit the higher quenching coefficients and the larger red shifts against those of negative blood types. This mainly arises from the nature of specific sugar antigens available on the RBC membranes as to N-acetylgalactosamine and galactose attached to the O-antigen terminal would enhance further quenching of the species. Moreover, a significant correlation appears between Stern-Volmer coefficients and the corresponding RBCs. In fact, distinct discrepancy takes place in quenching coefficients in terms various positive/negative blood types to envisage a facile method of blood typing.

ABO/Rh Blood Group and COVID-19 Infection Severity

Introduction:Early epidemiological studies of U.S. patients with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have suggested a possible association between ABO/Rh blood group phenotype and both susceptibility and severity of COVID-19 infection. Given the remarkable heterogeneity of the host inflammatory response in this viral syndrome and the widespread expression of ABO/Rh antigens on vascular and alveolar endothelial cells, it is biologically plausible that certain blood group phenotypes, with their unique repertoire of anti-A and/or anti-B antibodies, may differentially augment the host-pathogen response. We conducted a retrospective review of patients hospitalized for COVID-19 within our regional healthcare network in San Diego County to identify an association between ABO/Rh blood group type and the severity of infection.Methods:All patients hospitalized at one of five Scripps Health hospitals in San Diego County from March 1, 2020 to July 30, 2020 with a PCR confirmed diagnosis of COVID-19 and blood type on record were included in the initial analysis (n = 316). Demographic, laboratory and clinical data were extracted from the electronic medical record and included age, ethnicity, BMI, sex, medications, co-morbidities and admission white blood cell and lymphocyte count, hemoglobin, platelets, ESR, CRP and D-dimer. Outcomes of interest included length of hospitalization, intensive care unit (ICU) admission, mechanical ventilation need, and mortality. Significant associations between each parameter of interest and blood group type were determined using either linear or logistic regression analysis. To address potential confounding variables, an adjusted multivariate model accounting for potential significant (p< 0.1) predictors of each outcome on univariate analysis, in addition to blood type groups, was conducted to further refine any associations. The study was approved by the Scripps Health Institutional Review Board.Results:316 patients met inclusion criteria for analysis. Hospitalized COVID patients were predominantly male, obese (BMI 30.6) and were an average age of 63 years. Almost 70% of patients hospitalized were Hispanic. 57.0% of patients were blood type O, 30.4% were type A, 3.8% were type B and 8.9% were type AB. 7% were Rh negative. Median length of hospital stay was 16.5±14.7 days, 59% were admitted to the ICU, 37% were intubated, and 27% died. Further relevant laboratory values on admission, co-morbidities, and medications administered during hospitalization are summarized in Table 1. Blood type, with or without adjusting for other clinical variables, was not predictive of length of hospital stay, ICU admission, or intubation during the hospitalization. Type B blood alone was associated with decreased odds of death (OR: 0.27, 95% CI: 0.06-0.85, p<0.05), though this effect was not seen after adjusting for significant confounding variables (OR: 0.39, 95% CI: 0.08-1.43, p>0.18).Conclusion:In this large, multi-hospital, retrospective analysis of patients hospitalized for COVID-19 in San Diego County, there was a low relative percentage of Rh negative blood type and type B blood compared to historical population averages. Blood type was not determined to be independently associated with hospital length of stay, mechanical ventilation, ICU admission or death. ABO/Rh blood typing appears to have a limited prognostic role in COVID-19 severity of hospitalized patients, though further analysis of the protective effects of type B and/or Rh negative blood type may be warranted in a larger sample.DisclosuresNo relevant conflicts of interest to declare.

Prevalence of Dal blood type and dog erythrocyte antigens (DEA) 1, 4, and 7 in canine blood donors in Italy and Spain

BackgroundThe aim of this study was to determine the prevalence of Dal, and DEA 1, 4, 7 blood types, in a population of canine blood donors from Italy and Spain. Three hundred and twenty blood donor dogs receiving an annual health evaluation were included in the study. DEA 1 blood type was determined using an immunochromatographic strip technique while Dal, DEA 4 and 7 blood types were determined with polyclonal antisera using agglutination on gel columns.ResultsOut of 320 dogs blood typed 7 (2 Cane Corso and 5 Doberman Pinschers) (2.2%) were Dal negative; 137 (42.8%) were positive for DEA 1; 320 (100%) were positive for DEA 4 and 43 (13.4%) were positive for DEA 7.ConclusionThis study showed a similar prevalence of DEA 1, 7 and 4 to that reported in previous studies in the same, and in different, geographic areas, and provides new data on the prevalence of the Dal blood group in Italy and Spain. There was no significant difference (P = 0.8409) between prevalence of Dal negative blood types found in our population (2.2%) and the prevalence reported in a canine blood donor population from the USA (2.5%). Our study identified Dal negative dogs in a previously tested breed i.e. Doberman Pinschers, but also the Cane Corso breed was found to have Dal negative dogs.

Survey of Blood Groups DEA 1, DEA 4, DEA 5, Dal, and Kai 1/Kai 2 in Different Canine Breeds From a Diagnostic Laboratory in Germany.

More than twelve blood group systems have been described in dogs, but little is known about their distribution frequencies within breed populations. Here, we report on an extensive typing survey carried out using available reagents and either established or new clinical kits in purebred dogs from Germany. Leftover anticoagulated blood samples were examined using an immunochromatographic strip method for DEA 1, a gel column technique for Dal and Kai 1/2, and new card agglutination tests for DEA 4 and DEA 5 (which were partially compared with the gel column technique). Monoclonal antibodies were used for DEA 1 and Kai 1/2 typing, and polyclonal antibodies were used for all other types. Among the 206 dogs, 59.2% were DEA 1+, 100% DEA 4+, 9% (Card)/11% (Gel) DEA 5+, 89.3% Dal+, 96.6% Kai 1+, and 2.9% Kai 2+. None of the dogs were Kai 1+/2+, and only one was Kai 1–/2–. Dal– dogs were found in several breeds. Erythrocytes from most DEA 1+ dogs bound strongly on the strips. The agglutination reactions for DEA 5 on the new card tests were generally less than those on the gel column. The blood group pattern DEA 4+, DEA 5–, Dal+, Kai 1+/2– and either DEA 1+ or DEA 1– was found among 80% of the dogs. In this first extensive blood typing survey of purebred dogs from Europe, the proportions of positive and negative blood types were similar to those found in the United States and, for DEA 1, were also similar to those from other European countries, with considerable breed variation in blood types. The newer typing techniques seem to work well and will likely be useful for detecting and preventing specific blood type incompatibilities in the clinic.

Noninvasive fetal RHD genotyping of RhD negative pregnant women for targeted anti-D therapy in Australia: A cost-effectiveness analysis.

To undertake a cost-effectiveness analysis of noninvasive fetal RHD genotyping to target pregnant women for antenatal anti-D prophylaxis therapy. A decision-analytic model was constructed to compare RHD testing and targeted anti-D prophylaxis, with current universal anti-D prophylaxis among pregnant women with RhD negative blood type. Model estimates were derived from national perinatal statistics, published literature, donor program records, and national cost sources. One-way sensitivity analyses addressed the uncertainty of variables on the main findings. The unit cost for RHD genotyping was estimated at AU$45.48 (US$31.84). The "mean cost per healthy baby" was AU$7495 (US$5247) for universal prophylaxis and AU$7471 (US$5230) for targeted prophylaxis. The findings were sensitive to the unit costs of anti-D 625IU (AU$59-AU$88) (US$41-US$62), the genetic test (AU$36-AU$55) (US$25-US$39), and packaging/transport costs of the samples for testing (AU$15-AU$40, US$11-US$28 per sample). With RHD genotyping, 13938 women would avoid antenatal anti-D prophylaxis at a total cost savings to the National Blood Authority of AU$2.1 million (US$1.5 million) per year. To the health system, net cost savings of AU$159701 (US$111791) per year (0.05%) were predicted for total health care costs. Given the vulnerable supply of donor plasma and other health concerns, RHD genotyping is an economically sound option for Australia.

Prevalence of Dog Erythrocyte Antigen 1 in 7,414 Dogs in Italy.

The study aim was to establish the prevalence of DEA 1, the most immunogenic and clinically important blood group in canine blood transfusion, in 7,414 dogs from Italy. The potential sensitization risk following a first transfusion and the acute reaction risk following a second transfusion given without a cross-matching and blood typing test were also calculated. Dogs tested were purebred (4,798) and mongrel (2,616); 38.8% were DEA 1 negative and 61.2% were DEA 1 positive. High prevalence for DEA 1 positive blood type was found in Ariegeois and English Setter, whereas German Shepherd and Boxer had higher DEA 1 negative blood type. Breeds with blood type never reported before included French Brittany Spaniel and Pug showing a high prevalence of DEA 1 positive type, while French Bulldog and West Highland White Terrier were more often DEA 1 negative. Just 48.8% of purebred and 13.9% of mongrel dogs were considered as prospective blood donors based upon their blood type. Most of the breeds had a sensitization risk of 20.0–25.0%. Rottweiler and Ariegeois had less risk of sensitization (9.4 and 4.2%) and the minor risk of an acute transfusional reaction (0.9–0.2%). The prevalence of DEA 1 positive and negative dogs in Italy agrees with most of the data already reported in the literature.

Blood type classification using computer vision and machine learning

In emergency situations, where time for blood transfusion is reduced, the O negative blood type (the universal donor) is administrated. However, sometimes even the universal donor can cause transfusion reactions that can be fatal to the patient. As commercial systems do not allow fast results and are not suitable for emergency situations, this paper presents the steps considered for the development and validation of a prototype, able to determine blood type compatibilities, even in emergency situations. Thus it is possible, using the developed system, to administer a compatible blood type, since the first blood unit transfused. In order to increase the system's reliability, this prototype uses different approaches to classify blood types, the first of which is based on Decision Trees and the second one based on support vector machines. The features used to evaluate these classifiers are the standard deviation values, histogram, Histogram of Oriented Gradients and fast Fourier transform, computed on different regions of interest. The main characteristics of the presented prototype are small size, lightweight, easy transportation, ease of use, fast results, high reliability and low cost. These features are perfectly suited for emergency scenarios, where the prototype is expected to be used.