Nasopharyngeal Region Research Articles

Hypertonic Saline Nasal Rinse Intervention: Immunomodulatory Effects in Dairy Workers

ABSTRACT Objective Increased risk of occupational exposure to bioaerosols has long been recognized in livestock operations including dairy facilities. Spanning the inhalable fraction (0–100 μm), dairy bioaerosols comprise a wide variety of inflammatory components that deposit in the nasopharyngeal region. The resultant inflammatory response from bioaerosol exposure is likely driving the increased prevalence of respiratory disease observed in dairy workers. It is also thought the microbiome of the upper respiratory system may help mediate this inflammation. We investigated the viability of a low-cost hypertonic saline nasal rinse intervention in modulating inflammatory responses in bioaerosol exposed dairy workers and its impact on microbial diversity. Methods Pre- and post-shift nasal rinses were administered and collected alongside full shift inhalable personal breathing zone (PBZ) samples for each participant for up to 5 consecutive days. Treatment group participants (n = 23) received hypertonic saline rinses while control group participants (n = 22) received normotonic saline rinses. Particulate matter (PM) and endotoxin concentrations were quantified from PBZ samples using gravimetric and enzymatic analytical methods, respectively. Pre- and post-shift rinses were analyzed for pro- and anti-inflammatory markers and microbial diversity using a multiplex assay and 16S rRNA sequencing, respectively. Results PM and endotoxin concentrations were comparable between groups indicating similar exposures. Post-shift pro-inflammatory markers were significantly higher than pre-shift for IL-13 (p = .047), IL-1β (p < .001), IL-6 (p < .001), IL-8 (p < .001), and TNF-α (p = .024). There was no evidence of a difference in log concentrations between intervention group or day among any of the measured inflammatory markers. Anti-inflammatory IL-10 concentrations increased across the 5 sample days, independent of treatment group suggesting tonicity may not be driving the change. However, this result was not significant (p = .217). Nasal microbiome alpha (within sample) and beta (between sample) diversity metrics did not differ significantly between group or day demonstrating no adverse washout intervention effects. Conclusion This study provided encouraging results that warrant future research to further evaluate saline nasal rinses as a workplace intervention.

Evaluation of the Effects of Orthopedic Treatment on the Dentofacial Structure and Upper Airway of Subjects with Skeletal Class III Malocclusion.

The present study aimed to evaluate the effect of rapid maxillary expansion (RME) and face mask treatment on the upper airway in patients with maxillary retrusion in two dimensions using digital cephalograms and volumetric evaluation using acoustic rhinometric measurements. A total of 22 individuals with a concave profile and skeletal and dental Class III malocclusion during growth and development with a mean age of 9.9±1.38 years were included in the study. A bonded RME appliance and a petit face mask were adapted for the patients. Before treatment (T0) and after maxillary protraction (T1), lateral cephalometric films and acoustic rhinometric recordings were obtained. The dependent sample t-test was used for statistical evaluation. Cephalometric analysis revealed forward movement of the maxilla and backward downward rotation of the mandible. A significant increase was observed in the nasopharyngeal and oropharyngeal regions of the upper airway. Three-dimensional evaluation of the upper airway by acoustic rhinometry revealed only an increase in the volumes of the left nasal cavity after decongestant administration. A statistically significant increase in acoustic rhinometric measurements in nasal valves. When the correlation of the cephalometric findings of the nasopharyngeal region with the acoustic rhinometry findings was examined, no statistically significant relationship was found. As a result of this study, we observed an increase in the cephalometric measurements of the nasopharyngeal and oropharyngeal areas. A significant increase was observed in the minimal cross-sectional area measured by acoustic rhinometry.

Evaluation of Minimum Axial Airway Area and Airway Volume in Orthognathic Surgery Patients.

The aim of this study was to compare preoperative and postoperative linear, planar, and volumetric measurements in the pharyngeal airway in orthognathic surgery patients. Preoperative and postoperative cone beam computed tomography (CBCT) images of 60 patients, who underwent maxillary advancement with mandibular setback (Group I, n=25) and bimaxillary advancement (Group II, n=35), were compared. The airway was divided into 3 regions as nasopharynx, oropharynx, and hypopharynx. Linear and planar measurements were made on the reference sections of each region. The minimum axial airway area, the volume of 3 regions, and total airway volume were also measured. Regarding the linear, planar, and volumetric measurements, while there was a statistically significant increase in the measurements for all three regions in Group II, in Group I only the measurements in the nasopharyngeal region demonstrated a statistically significant increase postoperatively ( P <0.05). There was an increase in minimum axial airway areas in both groups; however, it was only statistically significant in Group II ( P <0.05). There was a statistically significant increase in total airway volumes in both groups ( P <0.05). A positive and good correlation was found between the percent increase in the minimum axial area and the percent increase in the total volume ( P <0.05). While bimaxillary advancement surgery results in a significant increase in the pharyngeal airway, mandibular setback with maxillary advancement caused an increase in the total airway. Changes that may occur in the airway should be considered while planning orthognathic surgery.

Speaker-independent speech inversion for recovery of velopharyngeal port constriction degreea).

For most of his illustrious career, Ken Stevens focused on examining and documenting the rich detail about vocal tract changes available to listeners underlying the acoustic signal of speech. Current approaches to speech inversion take advantage of this rich detail to recover information about articulatory movement. Our previous speech inversion work focused on movements of the tongue and lips, for which "ground truth" is readily available. In this study, we describe acquisition and validation of ground-truth articulatory data about velopharyngeal port constriction, using both the well-established measure of nasometry plus a novel technique-high-speed nasopharyngoscopy. Nasometry measures the acoustic output of the nasal and oral cavities to derive the measure nasalance. High-speed nasopharyngoscopy captures images of the nasopharyngeal region and can resolve velar motion during speech. By comparing simultaneously collected data from both acquisition modalities, we show that nasalance is a sufficiently sensitive measure to use as ground truth for our speech inversion system. Further, a speech inversion system trained on nasalance can recover known patterns of velopharyngeal port constriction shown by American English speakers. Our findings match well with Stevens' own studies of the acoustics of nasal consonants.

Differential expression of host oncogenes in human papillomavirus-associated nasopharyngeal and cervical epithelial cancers.

Human papillomavirus (HPV)-related cervical and nasopharyngeal cancers differ in molecular mechanisms underlying the oncogenic processes. The disparity may be attributed to differential expression of oncoproteins. The current study investigated the host oncogenes expression pattern in HPV-associated cervical and nasopharyngeal cancer. Formalin-fixed paraffin-embedded tissues originating from the nasopharyngeal and cervical regions were screened using Hematoxylin and Eosin staining. Genomic DNA and total RNA were extracted from confirmed cancer biopsies and non-cancer tissues (NC). HPV was detected by PCR using MY09/GP5+/6+ primers. Protein expression levels of AKT, IQGAP1, and MMP16 in HPV-infected cancers and controls were determined by immunohistochemistry. RT-qPCR was used to profile mRNAs of the oncogenes. AKT and IQGAP1 proteins were highly expressed in the epithelial cancers compared with the non-cancer tissues (p < 0.05). IQGAP1 and MMP16 mRNAs level was significantly higher in the cancers than in the NC (p < 0.05), but not AKT mRNA levels. MMP16 protein was ubiquitously expressed in all tissues. AKT mRNA level was significantly elevated in CC compared with NPC (p < 0.001). However, the difference in AKT, IQGAP1 and MMP16 proteins level between CC and NPC was not significant (p > 0.05). The oncoproteins expression level between the HPV-positive and HPV-negative cancer biopsies showed no significant difference (p < 0.05). Current study reports AKT but not IQGAP1 and MMP16 mRNAs differentially expression in cervical and nasopharyngeal cancers, independent of HPV infection status.

Eikenella corrodens isolated from pleural effusion: A case report

BACKGROUND The bacterium Eikenella , classified as a gram-negative member of the phylum Proteobacteria, is distinguished by its rarity, corrosive nature, facultative anaerobic properties, and conditional pathogenicity. It represents the sole species within its genus-Eikenella corrodens (E. corrodens )-and can be found colonizing both human and animal oral and nasopharyngeal regions. Additionally, it occasionally inhabits the gastrointestinal or urogenital tracts. However, its slow growth rate can be attributed to its high nutritional requirements. However, there is an uneven distribution of construction and diagnostic capacity in China which poses undeniable challenges for the clinical examination and analysis of this case, especially in the basic hospitals. CASE SUMMARY Here we presented a case of empyema associated with E. corrodens infection in a 67-year-old male patient without any previous history of infectious diseases in our primary hospital in Dongguan district of China. The patient was admitted due to recurrent worsening cough, sputum production, and dyspnea for 3 d, which had persisted for over 20 years. Moreover, the patient experienced a one-hour episode of unconsciousness. Upon admission, immediate comprehensive examinations were conducted on the patient which subsequently led to his admission to the intensive care unit. Meanwhile, the patient presented with drowsiness and profuse sweating along with bilateral conjunctival edema observed during initiation of non-invasive ventilation, suggesting empyema. A significant amount of coffee-colored malodorous pleural fluid was drained during the procedure above and sent to the laboratory department for inspection. Finally, laboratory culture results confirmed the presence of E. corrodens infection in the pleural fluid sample. The patient received antimicrobial therapy until died on day 22 in the hospital. CONCLUSION In this report, we presented a case of empyema associated with E. corrodens infection. Multiple courses of morphological examination, viable culture analysis, and biochemical identification revealed its difficulties in detecting distinctive characteristics, as well as a detection model worth promoting. It’s just that there were still certain deficiencies in terms of morphological assessment, biochemical identification, and drug susceptibility testing.

Tumor venéreo transmissível em sistema respiratório superior de canino

Transmissible Venereal Tumor (TVT) is one of the most common neoplasms that affect dogs. It has no predilection for sex or breed, but it has a higher incidence in free-ranging dogs that have access to the outdoors. Transmission occurs through the implantation of tumor cells from one animal carrying the disease to another during intercourse, or through contact between mucous membranes during the habit of licking the genitalia affected by the tumor. They generally present on the genitalia, and can also occur in extragenital regions, such as the snout, eye, mouth and subcutaneous tissue. The tumor has a multilobulated appearance, resembling cauliflower, is friable, hemorrhagic and grows irregularly. The diagnosis is made through anamnesis, physical examination, tumor cytology and histopathology for the definitive diagnosis. The treatment of choice is chemotherapy with vincristine sulfate, applied intravenously, weekly, always preceding a blood count to analyze the patient's general health status. Considering that TVT is not commonly described in the nasopharyngeal region of dogs, this work aims to report the case of a four-year-old Shitzu dog who presented the tumor, with conformations not characteristic of a TVT, in the nasopharyngeal region, diagnosed through tomography and histopathology of the tumor, removed after surgical incision.

Long-term efficacy analysis of radiotherapy and local management of metastases in patients with newly diagnosed oligometastatic nasopharyngeal carcinoma: A prospective, single-arm, single-center clinical study

PurposeWe conducted a single-center, single-arm study (NCT 03129412) to prospectively analyze the long-term outcomes of newly diagnosed patients with oligometastatic nasopharyngeal carcinoma (NPC) who received radical radiotherapy and local treatment of metastases. Patients and methodsPatients who reached disease controll after platinum-based palliative chemotherapy continued to receive radical radiotherapy for the nasopharyngeal region and neck. Appropriate local treatments were selected to treat the metastatic lesions. The primary endpoint of this study was overall survival (OS) and the secondary endpoint was progression-free survival (PFS). ResultsFifty-one patients were included in the final analysis. During a median follow-up of 60 months, the median OS and PFS were 53.87 and 24.23 months, respectively. The 1-year, 3-year, and 5-year PFS and OS rates were 76.5 %, 38.1 %, and 31.8 % and 98 %, 75.4 %, 45.6 %, respectively. Both single and multivariate analysis indicated that maintenance therapy after radiotherapy could significantly increase PFS (36.43 vs. 16.1 months, P = 0.005). The OS of patients with single organ metastasis was significantly better than that of patients with double organ metastasis (P = 0.001). In addition, the number of metastatic organs also significantly affected PFS in the multifactor analysis. ConclusionPatients with newly diagnosed oligometastatic NPC can achieve long-term survival after receiving radical radiotherapy to the primary site and local treatment for metastases.

Metagenomic insights into fungal community composition of the nasopharyngeal region of COVID-19 associated mucormycosis patients from India.

Coronavirus disease 2019 (COVID-19) associated mucormycosis (CAM) was reported predominantly from India during the second wave of COVID-19 and has a high mortality rate. The present study aims to understand the fungal community composition of the nasopharyngeal region of CAM-infected individuals and compare it with severe COVID-19 patients and healthy controls. The fungal community composition was decoded by analyzing the sequence homology of theinternal transcribed spacer-2-(ITS-2)region of metagenomic DNA extracted from the upper respiratory samples. The alpha-diversity indices were found to be significantly altered in CAM patients (p < 0.05). Interestingly, a higher abundance of Candida africana, Candida haemuloni, Starmerella floris, and Starmerella lactiscondensi was observed exclusively in CAM patients. The interindividual changes in mycobiome composition were well supported by beta-diversity analysis (p < 0.05). The current study provides insights into the dysbiosis of the nasal mycobiome during CAM infection. In conclusion, our study shows that severe COVID-19 and CAM are associated with alteration in mycobiomeas compared to healthy controls. However, the sequential alteration in the fungal flora which ultimately leads to the development of CAM needs to be addressed by future studies.

Re-evaluating a historic cohort of sinonasal and skull base mucoepidermoid carcinoma: an institutional experience

AimsPrimary mucoepidermoid carcinomas (MECs) of the sinonasal tract and nasopharynx are rare entities that represent a diagnostic challenge, especially in biopsy samples. Herein, we present a case series of MECs of the sinonasal and skull base and its mimics to evaluate the clinicopathological and molecular characteristics in order to avoid misdiagnosis.MethodsWe reviewed the pathology records of patients diagnosed from 2014 to 2022. Thirty MECs were consecutively diagnosed during that period.ResultsBased on morphological and fluorescence in situ hybridization (FISH) analyses, 30 tumors originally diagnosed as MECs were separated into MAML2 fusion-positive (7 cases) and MAML2 fusion-negative groups (23 cases), in which 14 tumors were positive for the EWSR1::ATF1 fusion; these tumors were reclassified to have hyalinizing clear cell carcinoma (HCCC). The remaining nine MAML2 FISH negative cases were reconfirmed as squamous cell carcinoma (SCC, 3 cases) which showed keratinization and high Ki-67 expression; DEK::AFF2 carcinomas (2 cases), in which DEK gene rearrangement was detected by FISH; and MECs as previously described (4 cases) with typical morphological features. Including 7 MAML2 rearrangements tumors, 11 MEC cases had a male-to-female ratio of 4.5:1, and 6 tumors arose from the nasopharyngeal region, while 5 tumors arose from the sinonasal region. The prognosis of this series of salivary gland-type MECs was favorable.ConclusionsOur study confirmed that HCCC runs the risk of being misdiagnosed as MEC in the sinonasal tract and nasopharynx, particularly with biopsy specimens. Careful histological evaluation with supporting molecular testing can facilitate pathological diagnoses.

An Investigation of Quality of Life of Head-and-neck Cancer Patients after Tumor Resection and Subsequent Prosthetic Rehabilitation: A Clinical Study

ABSTRACT Background: Head-and-neck cancer and its treatment can decrease the quality of life (QoL) of patients in consequence of the loss of structural and functional integrity of the oro- and nasopharyngeal region. Maxillofacial prosthetic treatment is advised when anatomical structures of the head and neck are not replaceable by living tissue, when recurrence is likely, when radiotherapy is administered, or when fragment of fractured bones are severely displaced. The aim of the study was to examine whether prosthetic rehabilitation of maxillofacial defects affects the QoL of patients using the University of Washington (UW)-QoL. Materials and Methods: This was the prospective interventional study using pre- and post-design using a convenience sampling method. The prosthesis was fabricated as per the clinical situation using heat-polymerized polymethyl methacrylate, maxillofacial silicone, or a combination of both. Results: The overall mean composite QOL score before rehabilitation was 68.05 ± 16.98 and after rehabilitation, it was 73.22 ± 11.28. Chewing and saliva (dryness of the mouth) had the lowest scores (55 ± 9.2, 62 ± 8.6, respectively) among all domains, whereas pain and anxiety had the highest scores (93 ± 3.7, 95 ± 1.5, respectively). The domains of appearance, speech, swallowing, chewing, saliva, and overall QoL showed statistically significant improvements postprosthetic rehabilitation. Conclusions: In the present study and selected population, the subjective analysis using UW-QOL showed that despite altered anatomy following resection and reconstruction, compromised physiology following chemoradiation, the oral cancer patients coped well and adapted to near-normal oral status after prosthetic rehabilitation. This was evident from their improved QOL after 1 month of prosthetic rehabilitation.

Quantitative evaluation of middle ear radiopacity in French bulldogs using X-ray imaging.

Radiographic examination of the middle ear in French bulldogs can be challenging due to their small ear cavity and thick walls. Quantifying opacity on radiographic images is required to determine normal or abnormal results. To quantify the radiographic opacity of the middle ear in French bulldogs and create a threshold for objective diagnosis. A study was conducted on 32 French Bulldogs using radiographic images. Significant difference tests were performed on the ears of patients with unilateral and bilateral middle ear filling on computed tomography. A threshold was established for detecting left-right asymmetry in the same individuals. In addition, comparisons were made between the filling and nonfilling middle ear groups to establish a threshold of pixel values that could determine single middle ear filling and nonfilling for different patient images. Significant differences were observed in the left-right difference in max, left-right difference in max-ave, and left-right ratio of max-ave between unilateral and bilateral filling groups. The max-ave left-right ratio had the highest area under the curve value with a cutoff of 1.077% and 92.3% sensitivity. The item that showed a significant difference between middle ear groups with and without filling was corrected for nasopharyngeal pixel values with a cutoff of 1.028% and 85% sensitivity. Pixel value ratios in the middle ear region can detect asymmetries in ear densities. The max value in the region compared to the same image's nasopharyngeal region can determine the filling. Combining individual ear evaluations and symmetry improves accuracy.

Association between the clinical presentation and outcome among smokers vs non- smokers COVID-19 patients in Kirkuk health care centers/Iraq

Abstract Background: Smoking is regarded as one of the most important reasons of diseases and lead to eight million deaths all over the world. Both factors including corona virus disease 2019 (COVID-19) infection related to smoking can primarily affect the lungs. COVID-19 is mainly transmitted through the respiratory tract (saliva), and the smoker group may be at a higher risk of contracting the virus because of impaired immune systems, reduced lung function, susceptible hygiene habits, and cross-infection. Objectives: The study aimed to determine if there is any association between the current smoking and the clinical severity and outcomes of disease among patients suffering from COVID-19 in Kirkuk city. Materials and Methods: Retrospective case series include 973 adult (≥18 years old) patients (525 male and 448 female) with confirmed COVID-19. The studied patients were diagnosed by reverse transcriptase-polymerase chain reaction (PCR) by taking a swab from a nasopharyngeal region during the period from July 2020 to October 31, 2021. The data were collected from patients on the first visit to health services system (Private Clinic, AL-shifaa Hospital, and Kirkuk General Hospital). The diagnosis of patients with COVID-19 pneumonia was based on symptoms. Presence of infiltration on chest X-ray or high-resolution CT scan with positive PCR swab for SARS-CoV-2 was found. The total number of patients included in the study was 974 (646 smokers and 328 non-smokers). A special questionnaire form was prepared for this purpose and distributed after receiving the verbal consent from them, and the data were collected by interviewing with them. Results: This study shows that the most affected age group between smokers and non-smokers was 50–59 years (47.35%–49.8%), respectively, with P value = 0.444. Regarding the sex, males from smoker group constitute a higher percentage (75.6%), in comparison to non-smoker group in which the females constitute a higher percent (56.2%) with a P-value = 0.000. Also the study reveals that the smoker group shows a high percent among patients with hypertension (33.8%), in comparison to the non-smoker group in which diabetes mellitus was the most comorbid disease (37.9%) with a P-value = 0.000. Conclusion: The study recommended that physicians can provide more attention to the smoking history in patients with COVID-19 infection, and more future advanced research is aimed to explain the mechanisms that decrease this risk.

Cone-Beam Computed Tomographic Evaluation of the Posterior Wall of the Nasopharynx in Turkish Population

Aim: This study aims to evaluate the radio-morphometry of important anatomical structures such as Rosenmüller fossa (RF), pharyngeal bursa (PB), and Eustachian tube (ET) in the posterior wall of the nasopharynx by cone beam computed tomography (CBCT).&#x0D; Material and Methods: The posterior wall of the nasopharynx was analyzed retrospectively in CBCT images of 110 patients. The depth and width of the Rosenmüller fossa (RF), pharyngeal bursa (PB), and Eustachian tube (ET), their distances to the posterior nasal spina (PNS) and mid-sagittal plane, and the angles between them were measured. RF was categorized into three types. The relationship between the measured values and gender, age groups, and RF types was investigated. The obtained variables were analyzed statistically.&#x0D; Results: The mean right RF depth was 8.2 and left RF was 8.6 mm. RF widths differed significantly by gender (right p=0.013, left p=0.004). There was a statistically significant positive correlation between RF-PNS distances and age (left r=0.314, p=0.001; right r=0.240, p=0.011). The prevalence of RF types was 31.8%, 19.5%, and 48.6% for type A, type B, and type C, respectively. In individuals with RF Type C, both RF and ET were located more lateral to the midline. The prevalence of PB was 45.5%.&#x0D; Conclusion: Nasopharyngeal carcinoma (NPC) most commonly occurs in the RF. A good knowledge of the anatomy and variations of the nasopharyngeal region is important in the early diagnosis of NPC. Oral and maxillofacial radiologists must know the anatomy of the nasopharynx to understand and interpret incidental findings in CBCT.

Management of Linguatula serrata infestation in a dog from Greece: a case report

Linguatuliasis is caused by the Arthropod parasite Linguatula serrata (family: Linguatulidae) a parasite with worldwide distribution and zoonotic importance, especially in warm subtropical and temperate regions. Dogs, cats, foxes, jackals, and other carnivores are the final hosts of this Arthropod while any mammal could be a potential intermediate host of this parasite. Adults L. serrata live in the nasopharyngeal region and lower respiratory system, embed their body into the mucosa of nasal pharyngeal cavities. A two year old spayed female dog of undetermined breed, weighting 29 kg that lives in a mountain village called Sella (Prefecture of Achaia, Greece) in a semi-free form, was presented in a veterinary clinic of Patra with history of progressive cough and sneezing, which started about 2 weeks earlier. Along with the dog, the owner brought a parasite that was expelled from the dog’s nose during the intense cough and sneezing the same day. Macroscopic morphological aspects of the parasite, in the laboratory under stereoscope, revealed an arthropod 3,8cm in length identified as L. serrata, also commonly called tongue worm. The dog was treated with Macrocyclice lactone and lavage of nasal cavities. Humans can become infected in two ways: either as an intermediate host (visceral linguatuliasis) or as an accidental final host (nasopharyngeal linguatuliasis), usually as a result of consumption of raw or poorly cooked meat of an infected intermediate host.

Exploring velar function in speech: An integrated approach using nasometry and high-speed nasopharyngoscopy

It is well established that coupling between the oral and nasal cavities is controlled by velopharyngeal opening and closing movements and that coarticulatory patterns in these movements can affect both the intelligibility and the naturalness of speech. In addition, poor control can cause individuals to develop undesirable compensatory patterns. Most studies of these patterns have relied on indirect methods to assess both extent and timing of movement due to the difficulty of direct observation of the velopharyngeal port. This study focused on the correlation between indirect and direct methods of assessing both timing and magnitude of velopharyngeal opening for coarticulation using complementary data from nasometry and a novel technique – high-speed nasopharyngoscopy. Nasometry measures the ratio of distinct nasal and oral cavity outflow to determine the degree of nasality in speech. High-speed nasopharyngoscopy captures images of the nasopharyngeal region and can resolve velar motion during speech. By aligning these data, we can infer the functional changes of the velopharyngeal port and show the correlation between its status and resulting acoustic effects. Preliminary findings replicate previous work on coarticulatory patterns associated with prosodic structure and low versus high vowels. This work will illuminate how variability in velar function affects phonetic outputs.

Point-wise spatial network for identifying carcinoma at the upper digestive and respiratory tract

ProblemArtificial intelligence has been widely investigated for diagnosis and treatment strategy design, with some models proposed for detecting oral pharyngeal, nasopharyngeal, or laryngeal carcinoma. However, no comprehensive model has been established for these regions.AimOur hypothesis was that a common pattern in the cancerous appearance of these regions could be recognized and integrated into a single model, thus improving the efficacy of deep learning models.MethodsWe utilized a point-wise spatial attention network model to perform semantic segmentation in these regions.ResultsOur study demonstrated an excellent outcome, with an average mIoU of 86.3%, and an average pixel accuracy of 96.3%.ConclusionThe research confirmed that the mucosa of oral pharyngeal, nasopharyngeal, and laryngeal regions may share a common appearance, including the appearance of tumors, which can be recognized by a single artificial intelligence model. Therefore, a deep learning model could be constructed to effectively recognize these tumors.

Molecular Basis of Host-Virus Interactions to Explain Relative Transmission and Severity Caused by Omicron and Delta variants of SARS-CoV-2

In India and other affected countries, Omicron variant of SARS-CoV-2 has shown faster transmission but less clinical severities when compared to Delta strain. Present study was aimed to investigate how molecular changes in the spike proteins of Omicron variant has increased its transmission but reduced the disease severity. We report molecular interactions of Spike proteins of Delta and Omicron variants with ACE-2 receptor to explain how change in chemical and physical nature of mutated amino acids of Omicron variant has affected the internalization competence of virus into host cell. The Research Collaboratory Structural Bioinformatics (RCSB) and Protein Data Bank (PDB) were used to construct ACE2-Spike Protein interaction. The binding affinity of both omicron and delta variant spike proteins with human ACE2 receptor was observed. Spike protein of Omicron variants has revealed total number of 93 dissimilarities of amino acids from Delta strain,15 of which are in its Receptor Binding Domain (RBD). Our study showed that RBD of Delta variant contained only one hydrophobic amino acid whereas there were 6 hydrophobic amino acids in the RBD of Omicron variant. We report that increased number of Hydrophobic Amino Acids in RBD of Omicron variant affects its binding with ACE2 receptor to enter into the cell. The failure of internalization of virus has increased concentration of extracellular virions at nasopharyngeal region leading to faster expulsion of infective droplets during coughing or sneezing to increase transmission but has reduced the severity of infection. The reported observations could prove to be of public health and therapeutic significance.

Airway and Oral microbiome profiling of SARS-CoV-2 infected asthma and non-asthma cases revealing alterations-A pulmonary microbial investigation.

New evidence strongly discloses the pathogenesis of host-associated microbiomes in respiratory diseases. The microbiome dysbiosis modulates the lung's behavior and deteriorates the respiratory system's effective functioning. Several exogenous and environmental factors influence the development of asthma and chronic lung disease. The relationship between asthma and microbes is reasonably understood and yet to be investigated for more substantiation. The comorbidities such as SARS-CoV-2 further exacerbate the health condition of the asthma-affected individuals. This study examines the raw 16S rRNA sequencing data collected from the saliva and nasopharyngeal regions of pre-existing asthma (23) and non-asthma patients (82) infected by SARS-CoV-2 acquired from the public database. The experiment is designed in a two-fold pattern, analyzing the associativity between the samples collected from the saliva and nasopharyngeal regions. Later, investigates the microbial pathogenesis, its role in exacerbations of respiratory disease, and deciphering the diagnostic biomarkers of the target condition. LEfSE analysis identified that Actinobacteriota and Pseudomonadota are enriched in the SARS-CoV-2-non-asthma group and SARS-CoV-2 asthma group of the salivary microbiome, respectively. Random forest algorithm is trained with amplicon sequence variants (ASVs) attained better classification accuracy, ROC scores on nasal (84% and 87%) and saliva datasets (93% and 97.5%). Rothia mucilaginosa is less abundant, and Corynebacterium tuberculostearicum showed higher abundance in the SARS-CoV-2 asthma group. The increase in Streptococcus at the genus level in the SARS-CoV-2-asthma group is evidence of discriminating the subgroups.

The Molecular Approaches and Challenges of Streptococcus pneumoniae Serotyping for Epidemiological Surveillance in the Vaccine Era.

Streptococcus pneumoniae (pneumococcus) belongs to the Gram-positive cocci. This bacterium typically colonizes the nasopharyngeal region of healthy individuals. It has a distinct polysaccharide capsule - a virulence factor allowing the bacteria to elude the immune defense mechanisms. Consequently, it might trigger aggressive conditions like septicemia and meningitis in immunocompromised or older individuals. Moreover, children below five years of age are at risk of morbidity and mortality. Studies have found 101 S. pneumoniae capsular serotypes, of which several correlate with clinical and carriage isolates with distinct disease aggressiveness. Introducing pneumococcal conjugate vaccines (PCV) targets the most common disease-associated serotypes. Nevertheless, vaccine selection pressure leads to replacing the formerly dominant vaccine serotypes (VTs) by non-vaccine types (NVTs). Therefore, serotyping must be conducted for epidemiological surveillance and vaccine assessment. Serotyping can be performed using numerous techniques, either by the conventional antisera-based (Quellung and latex agglutination) or molecular-based approaches (sequetyping, multiplex PCR, real-time PCR, and PCR-RFLP). A cost-effective and practical approach must be used to enhance serotyping accuracy to monitor the prevalence of VTs and NVTs. Therefore, dependable pneumococcal serotyping techniques are essential to precisely monitor virulent lineages, NVT emergence, and genetic associations of isolates. This review discusses the principles, associated benefits, and drawbacks of the respective available conventional and molecular approaches, and potentially the whole genome sequencing (WGS) to be directed for future exploration.