Instruct: Identify the main category of the given Medrxiv paper based on its title.
Query: Understanding national trends in COVID-19 vaccine hesitancy in Canada - April 2020 to March 2021
A study of the benefits of vaccine mandates and vaccine passports for SARS-CoV-2
Association of Initial Clinical Characteristics with the Need for the Intensive Care Unit and Hospitalization in Patients Presenting to the Emergency Department with Acute Symptomatic COVID-19
Vitamin D and COVID-19 Susceptibility and Severity in the COVID-19 Host Genetics Initiative: a Mendelian Randomization Study
Multi-Sequence Average Templates for Aging and Neurodegenerative Disease Populations
An international comparison of age and sex dependency of COVID-19 Deaths in 2020 - a descriptive analysis
Segmentation stability of human head and neck medical images for radiotherapy applications under de-identification conditions: benchmarking for data sharing and artificial intelligence use-cases
Reduction of exposure to simulated respiratory aerosols using ventilation, physical distancing, and universal masking
A Quick Displacement of the SARS-CoV-2 variant Delta with Omicron: Unprecedented Spike in COVID-19 Cases Associated with Fewer Admissions and Comparable Upper Respiratory Viral Loads
Comparison Of respiratory protection during exercising tasks between different wearing methods of replaceable particulate respirators and powered air-purifying respirators
Impact of COVID-19 pandemic on diet behaviour among UK adults: a longitudinal analysis of the HEBECO study
Estimating local outbreak risks and the effects of non-pharmaceutical interventions in age-structured populations: SARS-CoV-2 as a case study
Understanding the contexts and mechanisms of bluespace prescription programmes implemented in health and social care settings: a realist review
SARS-CoV-2 R.1 lineage variants prevailed in Tokyo in March 2021
The effect of competition between health opinions on epidemic dynamics
Generation of novel SARS-CoV-2 variants on B.1.1.7 lineage in three patients with advanced HIV disease
Bacterial culture use, etiology and antibiotic susceptibility of common bacterial infections in Indonesian hospitals in 2019
Exhaled particles from nanometre to millimetre and their origin in the human respiratory tract
Time to Recovery from Diabetic Ketoacidosis and its Predictors among Adult Diabetic Ketoacidosis Patients in DEBRE MARKOS Referral Hospital, North West Ethiopia, 2021: Retrospective Cohort Study
Psychometric properties of the Sleep Hygiene Index in a large Italian community sample.
Optimising health and economic impacts of COVID-19 vaccine prioritisation strategies in the WHO European Region
Associations of Epstein-Barr Virus Infection with Attention Deficit Hyperactivity Disorder, Learning Disability, and Special Education in U.S. Children
Describing the population experiencing COVID-19 vaccine breakthrough following second vaccination in England: A cohort study from OpenSAFELY
Risk Factor Stratification for Postoperative Delirium: A Retrospective Database Study
What has changed in the experiences of people with mental health problems during the COVID-19 pandemic? Findings from follow-up interviews using a coproduced, participatory qualitative approach
COVCOG 1: Factors predicting Cognitive Symptoms in Long COVID. A First Publication from the COVID and Cognition Study.