Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: SARS-CoV-2 seropositivity and subsequent infection risk in healthy young adults: a prospective cohort study
Border closure and travel restrictions to control the spread of COVID-19: an update to a Cochrane review
Population-Based Study of anti-SARS-CoV-2, Social Distancing and Government Responses in Joinville, Brazil
High-dimensional deconstruction of pancreatic ductal adenocarcinoma identifies tumor microenvironmental communities associated with survival
Effects of boosted mRNA and adenoviral-vectored vaccines on immune responses to omicron BA.1 and BA.2 following the heterologous CoronaVac/AZD1222 vaccination
Cost-effectiveness of whole area testing of asymptomatic SARS-CoV-2 infections in Merthyr Tydfil, 2020: A Modelling and economic analysis
Carriage of ESBL-producing Enterobacterales in wastewater treatment plant workers and surrounding residents - The AWARE Study
Development and validation of a multiple-choice question-based delirium care knowledge quiz for critical care nurses
Development of an ensemble machine learning prognostic model to predict 60-day risk of major adverse cardiac events in adults with chest pain
DeepOS: pan-cancer prognosis estimation from RNA-sequencing data
A phase I study of oral vitamin D3 supplementation in boys with X-linked adrenoleukodystrophy
Forecasting the Epidemiological Impact of Coronavirus Disease (COVID-19): Pre-vaccination Era
Mechanism of optimal time-course COVID-19 vaccine prioritization based on non-Markovian steady-state prediction
Mind the gap: Mapping Variation between National and Local Clinical Practice Guidelines for Acute Paediatric Asthma from the United Kingdom and the Netherlands
Analysis of the Number of Tests, the Positivity Rate, and Their Dependency Structure during COVID-19 Pandemic
SARS-CoV-2 infection in Africa: A systematic review and meta-analysis of standardised seroprevalence studies, from January 2020 to December 2021
Impaired Lymphocyte Responses in Pediatric Sepsis Vary by Pathogen Type
Quality-adjusted life expectancy norms for the English population
Nowcasting food insecurity on a global scale
Stakeholders' views on an institutional dashboard with metrics for responsible research
Clinical Decision Support Using a Partially Instantiated Probabilistic Graphical Model Optimized through Quantum Annealing: Proof-of-Concept of a Computational Method Using a Clinical Data Set
Evaluating the effects of re-opening plans on dynamics of COVID-19 in SP
Assessing the impact of race on glomerular filtration rate (GFR) prediction
Did the COVID-19 pandemic result in more family physicians stopping practice? Results from Ontario, Canada
Characterization of SARS-CoV-2 genetic structure and infection clusters in a large German city based on integrated genomic surveillance, outbreak analysis, and contact tracing
Protocol for a mixed methods exploratory study of success factors to escalation of care: the SUFFICE study