Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: Impact of vaccination and undetected cases on the COVID-19 pandemic dynamics in Qatar in 2021
Waning of Vaccine-Conferred Protection against SARS-CoV-2 Infection: Matched Case-Control Test-Negative Design Study in Two High-Risk Populations
Pediatric Croup during the COVID-19 Omicron Variant Surge
Endothelial dysfunction determines severe COVID-19 in combination with dysregulated lymphocyte responses and cytokine networks
Bone health risk assessment in a clinical setting: an evaluation of a new screening tool for active populations
Sensitivity of excess mortality due to the COVID-19 pandemic to the choice of the mortality index, method, reference period, and the time unit of the death series
The Acceleration Index as a Test-Controlled Reproduction Number: Application to COVID-19 in France
Diversity in antibody titer at an average of 87 days after the second dose of BNT162b2 mRNA coronavirus disease 2019 vaccine: data from a predominantly elderly population in a practice in Tokyo
Steroid Treatment Balance According To The Lymphocyte / White Blood Cells Ratio In COVID-19 Patients, A Retrospective Cohort Analysis
COVID-19 in 823 Transplant patients: A Systematic Scoping Review
Utilization of health care services before and after media attention about fatal side effects of the AstraZeneca vaccine
Mixed ancestry analysis of whole-genome sequencing reveals common, rare, and structural variants associated with posterior urethral valves
Association study of HLA with the kinetics of SARS-CoV-2 spike specific IgG antibody responses to BNT162b2 mRNA vaccine
Clinical Thrombosis Rate was not Increased in a Cohort of Cancer Patients with COVID-19
Staffing levels and hospital mortality in England: a national panel study using routinely collected data
Updating mortality risk estimation in intensive care units from high-dimensional electronic health records with incomplete data
Oxymatrine Induces Autophagy and Apoptosis in Human Poorly Differentiated Gastric Adenocarcinoma Cells via Slit2/Robo1 Signals
The impact of relationship to cancer patient and extent of caregiving on adherence to cancer screening in a diverse inner-city community
Mondo: Unifying diseases for the world, by the world
The SARS-CoV-2 B.1.351/V2 variant is outgrowing the B.1.1.7/V1 variant in French regions in April 2021
Risk factors for SARS-CoV-2 infection and hospitalisation in children and adolescents in Norway: A nationwide population-based study.
Strongyloides stercoralis infection induces gut dysbiosis in chronic kidney disease patients
A NOVEL METHOD FOR HANDLING PRE-EXISTING CONDITIONS IN PREDICTION MODELS FOR COVID-19 DEATH
Analyzing Healthcare Safety Climate Through A Collaborative Filtering of Safety Attitudes Questionnaire for A Hospital Case Study
Decoding mitochondrial genes in pediatric AML and development of a novel prognostic mitochondrial gene signature
Time to reinfection and vaccine breakthrough SARS-CoV-2 infections: a retrospective cohort study