Instruct: Identify the main category of the given Medrxiv paper based on its title.
Query: Seroconversion rate and socioeconomic and ethnic risk factors for SARS-CoV-2 infection in children in a population-based cohort
The impact of the COVID-19 pandemic on children with medical complexity
High vaccine effectiveness against COVID-19 infection and severe disease among residents and staff of long-term care facilities in Norway, November - June 2021
Assisted partner services for people who inject drugs: Index characteristics associated with untreated HIV in partners
Updating The Accuracy of Administrative Claims for Identifying Left Ventricular Ejection Fraction Among Patients with Heart Failure
The initial impact of a national BNT162b2 mRNA COVID-19 vaccine rollout
A Quantitative Evaluation of COVID-19 Epidemiological Models
Multiverse to inform neurological research: an example using recovery outcome of neglect.
Prognostic implications of structural heart disease and premature ventricular contractions in recovery of exercise
The impact of COVID-19 pandemic on influenza transmission: molecular and epidemiological evidence
SPECIFIC DETECTION OF SARS-COV-2 B.1.1.529 (OMICRON) VARIANT BY FOUR RT-qPCR DIFFERENTIAL ASSAYS
Dupilumab use is associated with protection from COVID-19 mortality: A retrospective analysis.
Vaccines provide disproportional protection to the increased hospitalisation risk posed by the Delta variant of SARS-CoV2: a meta-analysis
Implementing Essential Coaching for Every Mother during COVID-19: A Pilot Pre-Post Intervention Study
Convalescent Plasma in Critically ill Patients with COVID-19
Variation in English Covid booster uptake
Comparison of Pandemic Intervention Policies in Several Building Types Using Heterogeneous Population Model
Blood transcriptomic biomarkers of alcohol consumption and cardiovascular disease risk factors: the Framingham Heart Study
Cardiac Surgery during the Covid-19 Pandemic: Evidence from the first wave
Effects of B.1.1.7 and B.1.351 on COVID-19 dynamics. A campus reopening study
CD16ahigh NK cell infiltration and spatial relationships with T cells and macrophages can predict improved progression-free survival in high grade ovarian cancer
Short-term functional outcome in psychotic patients. Results of the Turku Early Psychosis Study (TEPS).
Diurnal modulation of subthalamic beta oscillatory power in Parkinson's disease patients during deep brain stimulation
Strong and Significant Associations of Single Nucleotide Variants (SNVs) in the Promoter and 3'-Untranslated Region (3'-UTR) of Vascular Endothelial Growth Factor (VEGF) Gene with Head and Neck Cancers
COVID-19 outcomes in hospitalized puerperal, pregnant, and neither pregnant nor puerperal women: a population study
Healthcare utilization and expenditure among people with type 2 diabetes and/or hypertension in Cambodia: results from a cross-sectional survey