Instruct: Identify the main category of the given Medrxiv paper based on its title.
Query: The Impact of New SARS-CoV-2 Variants on Vaccine Breakthrough: a pilot study on spreading infection in the communities
Anti-SARS-CoV-2 Antibodies Persist for up to 13 Months and Reduce Risk of Reinfection
Estimating area-level variation in SARS-CoV-2 infection fatality ratios
Plasma biomarkers associated with survival and thrombosis in hospitalized COVID-19 patients
Association between reactogenicity and SARS-CoV-2 antibodies after the second dose of the BNT162b2 COVID-19 vaccine
Predicting the epidemic curve of the coronavirus (SARS-CoV-2) disease (COVID-19) using artificial intelligence
Screening for Atrial Fibrillation in Older Adults at Primary Care Visits: the VITAL-AF Randomized Controlled Trial
Update of transmission modelling and projections of gambiense human African trypanosomiasis in the Mandoul focus, Chad
Distinct microRNA expression signatures of primary and secondary central nervous system lymphomas
A rapid assessment of wastewater for genomic surveillance of SARS-CoV-2 variants at sewershed scale in Louisville, KY
Axillary microbiota is associated with cognitive impairment in Parkinson's disease patients
COVID-19 vaccine acceptability and inequity in the United States: Results from a nationally representative survey
Making maternity and neonatal care personalised in the COVID-19 pandemic: results from the Babies Born Better Survey in the UK and the Netherlands
Mortality and outcomes after decompressive craniectomy in children with severe traumatic brain injury
Testing the phenotypic decanalization hypothesis: social determinants of hyperglycemia and type 2 diabetes in adult urban Argentinian population
Ruxolitinib As a Salvage Therapy for Acute and Chronic Graft-versus-Host Disease in Children and Young Adults: a single institution experience.
Molecular phenotypes associated with antipsychotic drugs in the human caudate nucleus
Combination of Baricitinib plus Remdesivir and Dexamethasone improves time to recovery and mortality among hospitalized patients with severe COVID-19 infection
Animals in higher education settings: Do animal-assisted interventions improve mental and cognitive health outcomes of students?  A systematic review and meta-analysis
A New Causal Approach to Account for Treatment Switching in Randomized Experiments under a Structural Cumulative Survival Model
Fine-mapping of melanoma-associated genomic regions identifies novel causal SNPs in the MTAP/CDKN2A and CASP8 loci
Prenatal Selective Serotonin Reuptake Inhibitor Exposure, Depression and Brain Morphology in Middle Childhood: Results from the ABCD Study
Genome-wide meta-analysis for Alzheimer's disease cerebrospinal fluid biomarkers
COVID-19 vaccination coverage and hesitancy among groups prioritised in Australia's vaccine rollout
An observational analysis of patient recruitment in clinical trials in France using real-word database PMSI.French patient recruitment in clinical trials using PMSI
The early dynamics of the SARS-CoV-2 epidemic in Portugal