Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: ddPCR Reveals SARS-CoV-2 Variants in Florida Wastewater
Modeling the emergence of vaccine-resistant variants with Gaussian convolution.COVID-19: Could the wrong strategy ruin vaccine efficiency?
Clinical performance of oral sponge sampling for detection by RT-PCR of SARS-CoV-2
Outcomes of SARS-CoV-2 Infection in Patients with Chronic Liver Disease and Cirrhosis: a N3C Study
Altered cerebellar oscillations in Parkinson's disease patients during cognitive and motor tasks
Evaluation of the Panbio™ COVID-19 Antigen Rapid Diagnostic Test in subjects infected with Omicron using different specimens
Mapping genetic determinants of 184 circulating proteins in 26,494 individuals to connect proteins and disease.
Decoding accelerometry for classification and prediction of critically ill patients with severe brain injury
Multicenter cohort study of multisystem inflammatory syndrome in children (MIS-C)
Enhancing Histopathological Colorectal Cancer Image Classification by using Convolutional Neural Network
Seropositivity of  HBV & HCV  among the Family Members of Chronic Viral Hepatitis Patients
Comparative study of immunogenicity and safety of Gam-COVID-Vac and Sinopharm BBIBP-CorV vaccines in Belarus
Predictors of SARS-CoV-2 infection in a multi-ethnic cohort of United Kingdom healthcare workers: a prospective nationwide cohort study (UK-REACH)
Two Separate, Large Cohorts Reveal Potential Modifiers of Age-Associated Variation in Visual Reaction Time Performance
The new Coronavirus (SARS-CoV-2) in Central America: Demographic-spatial simulations, Analyses of Molecular Variance (AMOVA) and Neutrality Tests in complete genomes from Belize, Guatemala, Cuba, Jamaica and Puerto Rico
Humoral immune response after COVID-19 infection or BNT162b2 vaccine among older adults: evolution over time and protective thresholds.
The effect of short-graft preparation with tape suspension and screw fixation on loss of knee extension following anterior cruciate ligament reconstruction: A retrospective cross-sectional analysis of public hospital cases from 2015 - 2017
DPP9 deficiency: an inflammasomopathy which can be rescued by lowering NLRP1/IL-1 signaling
A within-host model of SARS-CoV-2 infection
Spatial-temporal relationship between population mobility and COVID-19 outbreaks in South Carolina: A time series forecasting analysis
The herbal combination of Sugarcane, Black Myrobalan, and mastic as a supplementary treatment for COVID-19: a randomized clinical trial
Study on the usefulness of Direct Saliva sample Collection (DiSC) by polyester swab
Variation in the Incidence of ventriculostomy related infection in critically ill patients
Age-dependent inequalities in HIV/STI burden and care receipt among men and transgender persons who have sex with men in Nairobi
Serological study of CoronaVac vaccine and booster doses in Chile: immunogenicity and persistence of anti-SARS-CoV-2 S antibodies
The impact of HIV on women living with HIV and their families in low- and middle-income countries: A systematic review