Instruct: Identify the main category of the given Medrxiv paper based on its title.
Query: COVID-19 symptom frequency comparison: non-hospitalised positively and negatively tested persons with flu-like symptoms in Austria
A mathematical model for repetitive behaviors of Covid-19
External validation of 4C ISARIC mortality score in the setting of a Saudi Arabian ICU. Retrospective study.
Single-nuclei paired multiomic analysis of young, aged, and Parkinson's disease human midbrain reveals age-associated glial changes and their contribution to Parkinson's disease
Few Excess Mortality probably due to COVID-19 in Tokyo, Japan in August and October, 2020
PDGRFA-mutant gastrointestinal stromal tumours (GISTs) in Eastern England: clinicopathological features and outcomes of 50 patients diagnosed between 2008-2021
The influence of SARS-CoV-2 variants of concern on national case fatality rates
Relationship between five Epigenetic Clocks, Telomere Length and Functional Capacity assessed in Older Adults: Cross-sectional and Longitudinal Analyses
Gaseous micro-embolism (GME) is associated with systemic inflammatory response syndrome (SIRS) after open heart surgery. A missing piece of a complex puzzle?
Effectiveness of the BNT162b2 vaccine among children 5-11 and 12-17 years in New York after the Emergence of the Omicron Variant
The second COVID-19 emergency status declaration for Japan: effects as of February 7, 2021
Towards definitions of critical illness and critical care using concept analysis
Clinically visible progression indicators in age-related macular degeneration are transdifferentiated retinal pigment epithelium
Variations of the quality of care during the COVID-19 pandemic affected the mortality rate of non-COVID patients with hip fracture
All-cause mortality among patients treated with repurposed antivirals and antibiotics for COVID-19 in Mexico City: A Real-World Observational Study
Transcranial direct current stimulation combined with alcohol cue inhibitory control training reduces the risk of early alcohol relapse: a randomized placebo-controlled clinical trial
Selective visuoconstructional impairment following mild COVID-19 with inflammatory and neuroimaging correlation findings.
Higher Vaccination Rate Predicts Reduction in SARS-CoV-2 Transmission across the United States
Prevalence and risk factors for in-school transmission of SARS-CoV-2 in Massachusetts K-12 public schools, 2020-2021
Air pollution exposure and mitochondrial DNA copy number in the UK Biobank
Rapid emergence of SARS-CoV-2 Omicron variant is associated with an infection advantage over Delta in vaccinated persons
Business as Un-usual: Access to mental health and primary care services for people with severe mental illness during the COVID-19 restrictions
Broad Clinical Manifestations of Polygenic Risk for Coronary Artery Disease in the Women's Health Initiative
Can a greenhouse gas emissions tax on food also be healthy and equitable? A systematized review and modelling study from Aotearoa New Zealand
A demonstration of cone function plasticity after gene therapy in achromatopsia
Prediction of ADHD diagnosis using brief, low-cost, clinical measures: a competitive model evaluation