Epidemiological Analysis Research Articles

Molecular characteristics, clonal transmission, and risk factors of Clostridioides difficile among hospitalized patients in a tertiary hospital in Ningbo, China

BackgroundNosocomial transmission of Clostridioides difficile infection (CDI) has been documented in Ningbo, China. However, data on molecular characteristics, clonal transmission, and risk factors of CDI in this region remain limited.MethodsA cross-sectional study enrolled hospitalized patients with diarrhea during September to November 2021. Stool samples from all patients were tested for C. difficile, and isolated strains underwent toxin gene identification, genotyping, and antibiotic susceptibility testing. Whole-genome sequencing and epidemiological variables were analyzed in patients infected with C. difficile strains of the same sequence types (STs) to identify nosocomial transmission and risk factors for CDI.ResultsOf the 907 investigated patients, 115 (12.7%) had microbiologically proven CDI, as their diarrhea was associated with toxigenic C. difficile strains, which comprised 106 A+B+CDT−, 3 A−B+CDT−, and 6 A+B+CDT+. Predominant genotypes (ST2, ST3, ST35, and ST54) exhibited distinct antibiotic resistance patterns. ST54 strains showed higher resistance to erythromycin (100%) but lower resistance to moxifloxacin (18.2%) and gatifloxacin (18.2%) (χ2 = 10.24–16.65, p < 0.05). ST35 strains exhibited higher resistance to ciprofloxacin (66.7%) and tetracycline (33.3%) than other STs (χ2 = 13.30–20.19, p < 0.05). Genomic and epidemiological analysis revealed two nosocomial clonal transmission events caused by 5 ST35 strains (with ≤2 single nucleotide polymorphism differences), elucidating clonal transmission among different floors and buildings within the hospital. Prolonged hospitalization (> 10 days) (odds ratio [95% confidence interval], 1.76 [1.05–2.93]) and penicillin-class antibiotics (1.69 [1.11–2.58]) were risk factors for CDI, with the latter being an independent risk factor (1.57 [1.02–2.42]). For C. difficile ST35 infection, intensive care unit (12.00 [2.77–52.05]) and neurology departments (8.08 [1.46–44.65]) admissions were risk factors, with the latter as an independent risk factor (1.56 [1.01–2.40]).ConclusionMultiple C. difficile genotypes with varied antibiotic resistance patterns circulated in Ningbo, with ST35 causing nosocomial clonal transmission among different floors and buildings within the hospital. These findings and the identified risk factors necessitate enhanced surveillance and infection control in the region.

Applying population-specific incidence prevalence ratio benchmarks to monitor the Australian HIV epidemic: an epidemiological analysis.

Due to a lack of robust population denominators, Australia is unable to accurately monitor changes in the HIV epidemic for some populations. The ratio of HIV transmission relative to the number of people with HIV (an incidence prevalence ratio, or IPR) can measure such changes. The IPR is measured against an IPR benchmark derived from post-HIV acquisition life expectancy, to indicate whether an HIV epidemic is shrinking or growing. Using IPRs and Australia-specific IPR benchmarks, this study aims to describe the Australian HIV epidemic among three groups: men with HIV attributed to male-to-male sex, women with HIV and people with HIV attributed to injection drug use. Using mathematical modelling derived from HIV notifications, cohort and administrative data, IPRs were generated for each of the three groups. These IPRs were compared with IPR benchmarks derived from post-HIV acquisition mortality estimates using abridged life tables for men, women and people who inject drugs. The IPR benchmark for men was applied to people with HIV attributed to male-to-male sex. Trends in the IPR over time were described for each reported population from 2015 to 2022. Overall, the IPR fell by 80%, from 0.040 (range: 0.034-0.045) in 2015 to 0.008 (range: 0.003-0.013) in 2022 and fell below the benchmark (0.022) in 2020. Among people with HIV attributed to male-to-male sex, the IPR fell by 85%, from 0.041 (range: 0.034-0.047) in 2015 to 0.006 (range: 0.003-0.024) in 2022 and fell below the benchmark (0.022) in 2020. Among women with HIV, the IPR fell by 56%, from 0.032 (range: 0.026-0.039) in 2015 to 0.014 (range: 0.003-0.029) in 2022 and fell below the benchmark (0.022) in 2019. Among people with HIV attributed to injection drug use, the IPR fell by 61%, from 0.036 (range: 0.022-0.047) in 2015 to 0.014 (range: 0.002-0.057) in 2022 and fell below the benchmark (0.028) in 2019. Australian IPRs in all populations examined have dropped below the level required to sustain the HIV epidemic at current levels. By applying this method in other contexts, the changing scale of HIV epidemics may be better described for populations lacking robust population denominators.

Co-existence of airborne SARS-CoV-2 infection and non-infection in three connected zones of a restaurant

The lack of knowledge on quanta generation rates presents a major obstacle to specifying the minimum ventilation required to prevent airborne infections. The expected largest quanta generation rate of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) by a super-spreader remains unknown. Here we investigated a SARS-CoV-2 outbreak during lunch in a restaurant using epidemiological, whole-genome sequencing and environmental analyses. Both tracer gas and fine particles were used in field experiments to quantify aerosol dispersion and removal across three interconnected zones: Zone A, Zone B and Zone C. All 21 secondary patron infections occurred in Zone B. This unique infection feature and measured dilution flow rates allowed us to estimate the largest reported quanta generation rates to date, ranging from 1724 to 1968 quanta/h. These rates were sufficiently high to cause a high attack rate in Zone B but did not cause infections in Zones A and C, likely due to sufficient dilution and insignificant contaminated airflow from Zone B, respectively. Our finding of the largest quanta generation rate so far suggests that avoiding secondary infection by dilution alone in the presence of a super-emitter might not be possible in typical air-conditioned buildings and other prevention strategies need to be developed.

Epidemiological Analysis of Purple Blotch Disease on Onion under the Climatic Conditions of El-Minya Governorate, Egypt

Epidemiological Analysis of Purple Blotch Disease on Onion under the Climatic Conditions of El-Minya Governorate, Egypt

Big Data Visualization for Black Sigatoka Disease of Bananas and Pathogen–Host Interactions (PHI) of Other Plants

Black sigatoka is a leaf spot disease affecting banana plants that has caused significant yield reductions of up to 50% (Arman et al., 2023). This research presents data visualizations of 8,761 data points related to black sigatoka in banana plants, encompassing attributes such as time, canopy temperature, and relative humidity. The paper also reviews related work, including the application of data mining to plant studies, the use of deep learning neural networks for plant disease data, and the use of machine learning for predicting crop yields and detecting disease. Additionally, it presents big data visualizations for 20,952 values obtained from the web-accessible Pathogen–Host Interactions database (PHI-base), covering various plant disease categories and providing an epidemiological analysis of prevalent causative agents in specific plant diseases.

Geographic Determinants and Spatial Epidemiology of Prescription Drug Abuse: A Comprehensive Analysis of Distribution Patterns, Treatment Accessibility and Intervention Strategies

This study examines the complex spatial patterns and geographic variations in prescription drug abuse, analyzing their impact on treatment outcomes and public health interventions. Through comprehensive spatial epidemiological analysis, we investigate how geographic factors influence abuse patterns across urban, suburban, and rural landscapes. The research synthesizes data on healthcare accessibility, socioeconomic conditions, and regional policy frameworks to understand their collective impact on prescription drug misuse. Our findings reveal significant geographic disparities in treatment accessibility, with rural areas facing substantial barriers to addiction services compared to urban centers. Analysis of prescription drug monitoring programs demonstrates varying effectiveness across regions, highlighting the need for spatially-tailored interventions. The study identifies distinct regional profiles of drug misuse, influenced by factors including healthcare infrastructure, cultural norms, and local regulatory environments. Advanced spatial analysis techniques, including geospatial mapping and hotspot analysis, revealed significant correlations between geographic determinants and abuse patterns. Results indicate that proximity to healthcare facilities, pharmaceutical distribution networks, and demographic characteristics contribute to localized risk profiles. The integration of multiple data sources, including prescription records and treatment admissions, provided insights into space-time clustering of abuse patterns. This research emphasizes the importance of developing geographically-informed approaches to combat prescription drug abuse, suggesting that intervention strategies should be tailored to specific regional contexts while addressing broader systemic issues. The findings have significant implications for public health policy, healthcare resource allocation, and the development of targeted prevention strategies.

Epidemiological Analysis of Upper Extremity Amputations From Lawn Mower-Related Injuries.

Lawn mower-related injuries (LMIs) represent a complex spectrum of pathology with significant public health ramifications. The purpose of this study was to analyze the epidemiological factors associated with lawn mower upper extremity amputations. The National Electronic Injury Surveillance System (NEISS) database was queried from 2014 to 2023. National case estimates were established for upper extremity amputation events secondary to lawn mowers using diagnostic and injury-specific coding parameters. Documented cases from NEISS-participating hospitals were evaluated and injury data surrounding individual amputation events were analyzed. An estimated 17 509 upper extremity amputations occurred from 2014 to 2023 secondary to LMI in the United States. Annual case estimates and incidence rates remained relatively uniform across the 10-year study period. Most injuries were estimated to occur in 50- to 59-year-old patients. Case record review from pooled participating NEISS hospitals yielded 469 cases of upper extremity amputation directly associated with LMI from 2014 to 2023. Ninety-one percent of cases occurred in men, and most events involved the amputation of a finger (97%). Most cases of lawn mower-associated injury involved the amputation of the middle digit (41.6%) in isolation (64% of cases involved amputation of 1 digit). Despite advances in product safety and consumer education, the estimated frequency and incidence rate of upper extremity amputations secondary to LMI has remained largely unchanged over the past 10 years. When these events did occur, 40- to 60-year-old men were most often involved, most commonly leading to amputation of the third finger in isolation.

Prevalence and diversity of retinal disease in adults with Down syndrome.

While epidemiologic data exists for some ophthalmic diseases in people with Down Syndrome (DS), like strabismus and amblyopia, no studies explore the prevalence of retinal disease in people with DS on a large scale. This study utilized a literature review and exploratory epidemiology analysis to examine patterns of retinal disease in people with DS. To evaluate previous studies on physiology and/or anatomy in retinal models representing DS or in the retinas of people with DS, all relevant terms related to Down Syndrome, retina, and retinal diseases were searched in PubMed and Scopus. Data from the health platform TriNetX was then utilized to determine the prevalence and prevalence odds ratio (POR) of retinal disorders, including diabetic retinopathy and age-related macular degeneration (AMD), within the U.S. adult population with DS. The final literature review included 28 of 535 screened studies and found that a DS diagnosis was associated with atypical retinal vascularization, retinal thickening, and abnormal neuronal development. Of 55,198,979 individuals included in the population study, 97,795 (0.18%) had a recorded DS diagnosis. Compared to the population without DS, the population with DS had significantly increased PORs for any retinal diagnosis (3.78, 95% CI 3.63-3.93), for 16 of 18 recorded individual retinal diagnoses, and for 4 of 5 major diagnostic categories, including diabetic retinopathy (2.56, 95% CI 2.33-2.82) and macular degeneration (4.01, 95% CI 3.42-4.71). The conclusion is that retinal anomalies common to people with DS likely contribute to higher rates of recorded retinal disease. However, future studies should evaluate this relationship.

Genomic epidemiological analysis of a single-centre polyclonal outbreak of Serratia marcescens, Belgium, 2022 to 2023.

Serratia marcescens is an opportunistic pathogen with a propensity to cause nosocomial outbreaks, particularly in neonatal intensive care units (NICUs). We present a sustained outbreak spanning over 18 months (1 January 2022-29 August 2023) in a NICU in Antwerp, Belgium, affecting 61 neonates, identified through samples taken for diagnostic purposes and by rectal screening. Ten neonates were infected: five with lower respiratory tract infection, four with conjunctivitis and one fatal case with sepsis. In a logistic regression analysis, nursing in an incubator was significantly associated with acquisition of S. marcescens (odds ratio (OR): 2.99; 95% confidence interval (CI): 1.14-8.25; p < 0.05). Whole genome sequencing-based multilocus sequence typing (wgMLST) and core genome single nucleotide polymorphism (cgSNP) analysis of isolates from clinical (n = 4), screening (n = 52) and environmental samples (n = 8), identified eight clusters and five singletons not associated with the clusters. Although outbreak measures were successful in containing further spread within the ward during sudden surges when > 4 cases per week were identified (peak events), several peaks with different clonal clusters occurred. The emergence of similar outbreaks in Belgian hospitals underscores the need of continuous surveillance and NICU-specific infection prevention and control (IPC) measures.

Incidence, trend and distribution of transport-related injuries reported to health facilities in the Volta Region of Ghana, 2019 to 2023

BackgroundTransport injuries are a global public health concern, causing 1.35 million deaths and over 20 million non-fatal injuries annually. Low- and middle-income countries, particularly countries in Africa, are experiencing an increase in fatalities. Ghana and the Volta Region are not exempted from the burden, prompting targeted interventions. In the development of these interventions, epidemiological data analysis is needed to identify areas for action. This study aimed to analyze the distribution, trends, and incidence of transport-related injuries in the Volta Region of Ghana.MethodSecondary data was analyzed to describe transport-related injury cases and deaths in the Volta Region of Ghana from 2019 to 2023. Transport-related injuries were obtained from the monthly out-patient morbidity report form whereas transport related deaths were obtained from the inpatient morbidity and mortality, and cause of death report forms. Descriptive data analyses were performed and reported as frequencies, proportions, ratios, and choropleth maps.ResultOf the 33,415 transport-related injury cases reported between 2019 and 2023, 25 were fatal. The highest proportion of cases, 35.8% (35.3–36.4), was among persons aged 20–34 years. About 66.0% (65.5–66.5) of all the cases involved males. The cumulative incidence was 387 injuries per 100,000 population with the highest incidence recorded in 2021. The incidence of cases declined from 357 per 100,000 population in 2019 to 320 per 100,000 population in 2023. The death rate was stable over the period with the highest of 1.2 per 1000 recorded in 2019 and declined from 1.2 per 1000 in 2019 to 0.9 per 1000 in 2023. Most, 56% of the deaths were reported in district hospitals.ConclusionThe study showed a decreasing trend in the incidence of transport injuries, but a steady mortality rate in the Volta Region. Young adults were the highest affected group. There is the need for increased road safety campaigns and further research.

Epidemiological Analysis of Psoriasis in China from 2020 to 2022.

Psoriasis is a persistent inflammatory skin condition driven by an immune response and influenced by both genetic and environmental factors. The high likelihood of disease recurrence has been a major concern for many patients, while the concurrent presence of other conditions has significantly impacted their quality of life. To improve early detection of and treatment for patients by studying the epidemiological characteristics of patients with psoriasis in China. The Psoriasis Real-World Big Data Collection Platform was initiated by the National Skin and Immune Diseases Clinical Medical Research Center (Beijing First Hospital of Peking University) in August 2020. During the period from August 2020 to June 2022, a total of 1012 hospitals across the nation participated in data entry. This article presents an epidemiological feature analysis based on the real case questionnaire survey form collected over the past 2 years. The prevalence of psoriasis is highest among young and middle-aged men, affecting largely the skin area. Factors such as smoking, obesity, and family history are likely to influence disease onset. In this study's data, the limbs and trunk were the most common sites for psoriasis onset, with cardiovascular disease being the most prevalent comorbidity. Topical corticosteroid creams are frequently used in treatment by Chinese patients, along with a notable proportion opting for oral Chinese medicine for systemic treatment. Secukinumab is the primary choice when utilizing biological agents. The actual data of patients with psoriasis from 2020 to 2022 offer crucial insights into the disease progression among the Chinese psoriasis population in recent years. Through an analysis of patient characteristics and treatment modalities, it furnishes valuable guidance for the prevention, early detection, and management of psoriasis.

The Demography, Longevity and Mortality of Bullmastiffs Attending Veterinary Practices in Australia

The Bullmastiff is a giant breed of dog, and there is evidence the breed is predisposed to cancer and musculoskeletal disorders, though the disease investigation of the breed is limited. This study reports on the demography, longevity and mortality of Bullmastiffs attending veterinary practices in Australia over a ten-year period. VetCompass Australia collects patient data from veterinary practices across Australia for epidemiological analysis. All patient records of Bullmastiffs available in the VetCompass Australia database during this decade period were reviewed, with demographic information on the breed inclusive of coat colour, sex, neuter status, weight and location collated. Standardised veterinary diagnostic (VeNom) codes for the most appropriate cause of death were assigned to deceased dogs. The population comprised 2771 Bullmastiffs with an overall median age of 2.8 years. Within the group, 1259 were female (45.4%), 1491 were male (53.8%), and 21 dogs (0.8%) had no recorded sex or neuter status. Dogs grew rapidly in their first year, with an average gain of approximately 1 kg every 10 days. A slower growth rate continued in their second year, and growth plateaued as adulthood was reached, with the mean body weight of adult male dogs (46.6 kg) being heavier than that of females (40.5 kg). The age at death for the group was 8.5 years. The most common causes of death in the breed were mass lesions (28.2%), old age (9.9%), musculoskeletal-related disease (9.9%) and neurological (5.3%) and behavioural disorders (4.8%). Neutering was protective against mortality from urogenital causes (OR: 0.14; CI: 0.02–0.52; p = 0.003) and had a positive effect on longevity. This study provides demographic and health information on a population of Bullmastiffs attending veterinary practices in Australia, which will benefit evidence-based veterinary decisions for this breed. Additionally, the results may assist owners and breeders in making informed decisions on health risks and breeding programmes in the population.

Prevalence and Epidemiology of Diabetes in West Africa: Trends and Challenges

Diabetes mellitus (DM) has emerged as a major public health concern in West Africa, marked by a notable rise in prevalence due to rapid urbanization, lifestyle changes, and socioeconomic factors. This review examines the current epidemiology of diabetes in the region, discussing key trends, risk factors, and the socioeconomic determinants contributing to its rising prevalence. Urbanization has led to sedentary lifestyles and increased consumption of energy-dense diets, significantly raising Type 2 diabetes cases. Epidemiological analysis shows that factors such as genetic predispositions, obesity, and socioeconomic disparities impact diabetes risk and management. Diabetes management faces numerous challenges, including limited healthcare infrastructure, low public awareness, and financial barriers that hinder access to essential care, diagnostics, and medications. Addressing this growing crisis requires a multifaceted approach, involving improved healthcare systems, targeted awareness campaigns, and socioeconomic support to foster early detection and promote healthier lifestyle choices. This review emphasizes the urgency for collaborative efforts to mitigate the diabetes burden and improve outcomes for affected populations in West Africa. Keywords: Diabetes mellitus, West Africa, prevalence, epidemiology, Type 2 diabetes, public health, urbanization.

Analysis of the incidence of influenza and acute upper respiratory tract infections under conditions of routine influenza vaccination

Background. Acute upper respiratory tract infections and influenza, while maintaining high epidemiological, social and economic significance, have a major effect on the public health of countries and individual regions.The aim. To study the impact of influenza vaccination on the manifestations of the epidemic process of influenza and acute upper respiratory tract infections in the Irkutsk region.Materials and methods. Epidemiological analysis of the incidence of acute upper respiratory tract infections and influenza, analysis of influenza mortality and the impact of vaccination on these infections were performed using continuous samples of statistical data from the Directorate of Rospotrebnadzor in the Irkutsk Region for the period of 2003–2022 (forms 2, 5).Results. The intensity of the epidemic process of acute upper respiratory tract infections among the general population, children and adults during the observation period was characterized by an uneven course with a tendency towards increase. The dynamics of the incidence of acute upper respiratory tract infections in children and adults demonstrates multidirectional trends over the compared periods. The incidence of influenza in the general population had a steady downward trend, the decrease rate was –8.4 %. At the same time, there are significant changes in the intensity of the epidemic process in the compared periods. The proportion of adults increased in the structure of cases of acute upper respiratory tract infections, and the proportion of children increased in the structure of cases of influenza. Significant changes in the epidemic seasons of influenza are shown. Since the beginning of routine influenza vaccination in the region, the number of vaccinated people has increased annually – from 23.6 to 61.7 % of the population. Against the background of the influenza vaccination campaign, a statistically significant decrease in the incidence of acute upper respiratory tract infections among the general population and children under 14 years of age was registered (p &lt; 0.01).Conclusion. In the Irkutsk region, the epidemiological disadvantage for the studied infections persists. Increasing the regulated indicators of population coverage with preventive influenza vaccinations (75 % and more) will help reduce the incidence rate.

EPIDEMIOLOGY OF ACCIDENTS WITH VENOUS ANIMALS THAT OCCURRED IN THE FEDERAL DISTRICT BETWEEN 2010 AND 2020

This study analyzed and outlined the epidemiological profile of accidents with venomous animals that occurred and were reported in the Federal District, Brazil, between 2010 and 2020. This is an epidemiological, observational, descriptive, and retrospective study. It analyzed data obtained directly by the health department of the Federal District, including all data on accidents with venomous animals (snakes, spiders, scorpions, bees, and caterpillars) that occurred between 2010 and 2020. A total of 3,159 accidents were recorded and reported in the period, of which 241 involved snakes, 201 involved spiders, 2,445 involved scorpions, 176 involved bees, and 94 involved caterpillars. The prevalence of accidents occurred with people aged between 20 and 29 years, in urban areas. The results are in accordance with the national standard. Brazil is a reference in the diagnosis and treatment of accidents involving venomous animals. Each year, the number of accidents reported has been increasing progressively. The data reveal an upward trend in the number of registered cases of accidents involving venomous animals. However, we can see that, even in 2020, much information was filled out in an ignored manner or without information (empty), in the notification forms. It is of utmost importance that the data be described in full for better future epidemiological analyses.

Current epidemiological characteristics of cervical cancer in the Russian Federation

Background. The prevalence of cervical cancer (Cca) in Russian women makes it crucial to study modern epidemiological characteristics and adjust control measures accordingly.The aim. To analyze trends in the incidence of cervical cancer in the Russian Federation.Materials and methods. A retrospective epidemiological study was conducted on cervical cancer incidence in Russian Federation from 2008 to 2021. The materials of annual statistical data “Malignant neoplasms in Russia (morbidity and mortality)” and “Status of oncological assistance to the population of Russia” (2008–2022), data of the federal statistical reporting form No. 5 “Information about preventive vaccinations” (2021), data on the number of studies conducted (cytological study and HPV-test based on RT-PCR) in the clinical diagnostic laboratory of Central Research Institute of Epidemiology of Rospotrebnadzor (2013–2021) were used.Results and discussion. The trends of Cca incidence varied depending on the women’s age. Starting in 2016, there was a stabilization of the level of morbidity in women aged 30–49 with the subsequent decrease from 2019 due to the strengthening of secondary prevention measures, including the active introduction of HPV-test into the diagnostic schemes conducted in the Russian Federation. Increased control of cervical cancer caused a rise in the proportion of cases diagnosed at an early stage (carcinomas in situ and I–II stages Cca), the increase of detection rate of in situ carcinomas per 100 cases of Cca, the growth of the proportion of carcinomas in situ to I–II stages Cca, rise of the percentage of the cases detected actively, decrease of the number of Cca cases detected at later stages and one-year mortality index.Conclusion. The epidemiological analysis of cervical cancer incidence shows that preventive measures are effective and that there is a need to intensify and increase their coverage.

Race adjustment hides and perpetuates systemic racism: Real world example using life tables.

Extant research shows that race adjustment in epidemiologic analyses could lead to masking of systemic racism. In this study, we compare race-adjusted and -unadjusted years of life lost (YLL), a measure of societal burden, to understand the impact of race adjustment in YLL estimation. We used North Carolina (NC) Violent Death Reporting System data from 2006-2019 linked to 2006-2019 race-adjusted and -unadjusted life tables from the Centers for Disease Control and Prevention by calendar year and age at death. We calculated total YLL and YLL per death from suicide and homicide deaths for non-Hispanic black and non-Hispanic white NC residents using both the race-adjusted and -unadjusted life tables. We found that YLL and YLL/death from suicide and homicide deaths for non-Hispanic white individuals were almost identical regardless of race adjustment. However, race-adjusted life tables vastly underestimated total YLL and YLL per death for non-Hispanic black NC residents. Overall, race adjustment resulted in an underestimation of 14,907 YLL from homicide deaths (3.1 fewer YLL/death) and 4,414 YLL from suicide deaths (2.8 YLL/death) for black NC residents. Our study shows that the baked-in underestimation of YLL for non-Hispanic Black Americans when using race-adjusted life tables hides racialized health disparity and perpetuates inequity.

ANÁLISE DO PERFIL EPIDEMIOLÓGICO DAS INTERNAÇÕES E ÓBITOS POR LEUCEMIA NO BRASIL NA FAIXA ETÁRIA PEDIÁTRICA: UMA ANÁLISE DO ANO DE 2017 ATÉ A ATUALIDADE.

The present study is based on the epidemiological analysis of leukemia, the most common childhood cancer, which has a high prevalence and incidence rate in the pediatric population, as well as a significant impact on mortality in this age group. The objective of this research is to analyze the national profile of hospital admissions and deaths due to leukemia from 2017 to the present. For this purpose, secondary data from the Hospital Information System (SIH) and the Mortality Information System (SIM), collected from the DATASUS digital platform, were used. The selected variables included age groups under 1 to 19 years, male and female gender, and racial/ethnic categories of white, mixed-race, black, Asian, and indigenous populations. The results revealed a higher prevalence and incidence of hospitalizations for leukemia over the years, particularly in the Southeast, Northeast, and South regions, with a significant concentration in the 1 to 9-year age group, among males, and in the mixed-race and white populations. Regarding the number of deaths, substantial data were observed in the Southeast, Northeast, and North regions, predominantly in individuals aged 10 to 19 years, among males, and in the white and mixed-race populations. Given the above, the urgency of addressing leukemia in the pediatric population in Brazil is evident, as it impacts patients’ quality of life, the vital statistics of this population, and the healthcare system. The data highlight the need for public health actions to reduce regional disparities in specialized cancer care, late diagnoses, and ineffective and limited treatments.

Successful colonization of the testicular germinal epithelium by bone marrow stem cells producing spermatozoa of donor genotype is rare

AbstractBackgroundIt is not known whether bone marrow stem cells when injected intravenously for a bone marrow transplant colonize the human testicular epithelium. No previous studies of sperm genotype after bone marrow transplantation are reported.ObjectivesTo differentiate host from donor genotype in spermatozoa of men who have undergone successful bone marrow transplants.Materials and methodsTriplet DNA samples (spermatozoa, blood, and hair) obtained from men who had recovered sperm production after bone marrow transplant were genotyped using 44 autosomal and three sex‐related single nucleotide polymorphisms to determine the tissue genotype in pairwise comparisons of DNA profiles.ResultsParticipants were 14 men at a median of 5.5 years after allogeneic bone marrow transplant who had a median sperm output of 77 million spermatozoa/ejaculate. In 14/14 the donor (leukocyte) DNA genotype differed significantly from the spermatozoa and hair genotypes whereas hair and sperm genotypes showed no variations.DiscussionThese data suggest that paternity after a successful bone marrow transplant is likely to be of the host and not the donor's genetic origins. The study's small sample size reflects the paucity of eligible man with recovered spermatogenesis after bone marrow transplant and represents preliminary evidence. A large‐scale epidemiological analysis to estimate the frequency of bone marrow donor stem cell colonization of the testicular germinal epithelium based on progeny sex ratio and frequency of female donors is proposed.ConclusionSuccessful colonization of the testicular germinal and hair follicle epithelia by allogeneic bone marrow transplant donor stem cells is rare or does not occur.

Complex chromosomal rearrangements in female carriers experiencing recurrent pregnancy loss or poor obstetric history and literature review.

Complex chromosomal rearrangements (CCRs) often remain unidentified as they are rarely observed in the general population. Females with CCRs are generally recognized on the identification of an affected child with multiple congenital anomalies (MCA) or having a history of repeated pregnancy loss/bad obstetric history (RPL/BOH). In contrast, males with CCRs are diagnosed primarily due to infertility. This study aimed to carry out a systematic epidemiological analysis of CCRs in one of the largest series from the Indian population. In addition, a review of the literature on female CCR carriers experiencing RPL/BOH has been compiled in an attempt to identify the genomic landscape of breakpoints, commonly involved chromosomes, and the breakpoint regions. A total of 8560 healthy individuals with normal physical and mental well-being and had no history of any obvious genetic disorder at the time of presentation were referred for chromosome analysis in view of RPL/BOH between 1994 and 2024. Of them, 8158 had a normal chromosome complement whereas, 402 (4.7%) showed chromosomal aberrations. CCRs were detected in seven individuals, i.e., one partner in each of seven couples with structural rearrangements, all of whom were females. Comprehensive characterization of CCR was carried out using various molecular cytogenetic techniques. Seven CCR carriers had a total of 25 pregnancies: 20 leading to miscarriages (80%), one leading to the birth of an abnormal child (4%), two medically terminated pregnancies (8%) due to abnormal antenatal findings, and the remaining two were healthy (8%). A total of 13 different chromosomes with 24 non-recurring breakpoints were identified in these cases. Chromosome (#) 2 showed four breaks (16.7%), followed by #1, #4, #6, and #13 with three breaks each (12.5% each), while one break each (4.2% each) was seen on the remaining eight chromosomes (#3, #5, #8, #11, #14, #15, #17, and #21). Type I and type IV CCRs were observed in five (71.4%) and one case (14.3%), respectively, along with a "not a true" CCR (14.3%) in the present study group. Overall, the prevalence of CCRs in couples with RPL/BOH was 0.16%. To the best of our knowledge, this is the first study on the epidemiology of CCRs in couples with RPL/BOH of Indian origin. The incidence of CCRs in couples experiencing RPL/BOH in the present cohort was found to be 0.16% with type I CCR being the most predominant of all types, which is congruent with observations from non-Hispanic white and South East Asian populations. The uniqueness and rarity of each CCR pose a challenge in genetic and reproductive counseling.