Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: Seroprevalence of SARS-CoV-2 antibodies prior to the widespread introduction of vaccine programmes in the WHO European Region, January - December 2020: a systematic review
The effect of SARS-CoV-2 variant B.1.1.7 on symptomatology, re-infection and transmissibility
The missing microbes: Bifidobacterium and Faecalibacterium depletion and loss of microbiome diversity as potential susceptibility markers for SARS-CoV-2 infection and severity
An Approach for Open Multivariate Analysis of Integrated Clinical and Environmental Exposures Data
Population Pharmacokinetic Analysis of Dexmedetomidine in Children using Real-World-Data Obtained from Electronic Health Records and Remnant Clinic Samples
A six-month periodic fasting reduces microalbuminuria and improves metabolic control in patients with type 2 diabetes and diabetic nephropathy: a randomized controlled study
Microbial GWAS studies revealing combinations of Omicron RBD mutations existed and may contribute to antibody evasion and ACE2 binding
A Multi-Site Analysis of the Prevalence of Food Security in the United States, before and during the COVID-19 Pandemic
Heterozygous and homozygous variants in STX1A cause a neurodevelopmental disorder with or without epilepsy
Predictors of poor outcome in patients diagnosed with drug-resistant tuberculosis in the Torres Strait / Papua New Guinea border region
The mental health impact of COVID-19 racial and ethnic discrimination against Asian American and Pacific Islanders
A Second Wave? What Do People Mean By COVID Waves? - A Working Definition of Epidemic Waves
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
Unplanned Hospital Visits after Ambulatory Surgical Care
Associations between health literacy and sociodemographic factors: A cross-sectional study in Malaysia utilising the HLS-M-Q18
Estimating the Effects of Legalizing Recreational Cannabis on Newly Incident Cannabis Use
Defining the Critical Components of Informed Consent for Genetic Testing: A Delphi Study
Population-scale patient safety data reveal inequalities in adverse events before and during COVID-19 pandemic
The Association of Opening K-12 Schools with the Spread of COVID-19 in the United States: County-Level Panel Data Analysis
Immunological dysfunction persists for 8 months following initial mild-moderate SARS-CoV-2 infection
Nine-month presence of SARS-CoV-2 in saliva: a case report
The preoperative abundance of Prevotella associates with anastomotic healing after colorectal surgery.
CRISIS AFAR: An International Collaborative Study of the Impact of the COVID-19 Pandemic on Youth with Autism and Neurodevelopmental Conditions.
Adapting cleft care protocols in low- and middle-income countries during and after COVID-19: a process-driven review with recommendations
A PTX3/LDH/CRP signature correlates with lung injury CTs scan severity and disease progression in paucisymptomatic COVID-19
Stimulant Use Interventions May Strengthen 'Getting to Zero' Initiatives in Illinois: Insights from a Modeling Study