Instruct: Identify the main category of the given Medrxiv paper based on its title.
Query: COVID-19 vaccine effectiveness against severe disease from the Omicron BA.1 and BA.2 subvariants: surveillance results from southern Sweden, December 2021 to March 2022
SIR model for assessing the impact of the advent of Omicron and mitigating measures on infection pressure and hospitalization needs
REACT-2 Round 5: increasing prevalence of SARS-CoV-2 antibodies demonstrate impact of the second wave and of vaccine roll-out in England
Adolescent-led sexual and reproductive health and rights research: qualitative evaluation of an innovative participatory action research project in Senegal
Human germline biallelic complete NFAT1 deficiency causes the triad of progressive joint contractures, osteochondromas, and susceptibility to B cell malignancy
Prevalence and risk factors of internet gaming disorder and problematic internet use before and during the COVID-19 pandemic: A large online survey of Japanese adults
THE US MIDLIFE MORTALITY CRISIS CONTINUES: INCREASED DEATH RATES FROM CAUSES OTHER THAN COVID-19 DURING 2020
Long-term sequelae of Pneumococcal Sepsis in children: a systematic review
Probiotic supplements reduce antipsychotic-induced metabolic disturbances in drug-naive first-episode schizophrenia
Usual Source of Primary Care and Preventive Care Measures in a Pandemic: A Nationwide Study in Japan
Treatment of sarcoidosis with cutaneous involvement with tofacitinib
Details of "conversion therapy" practices and concordance with legislative definition: Findings from a non-probability community-based survey in Canada, 2020
Efficient mucosal antibody response to SARS-CoV-2 vaccination is induced in previously infected individuals
Evidence for a serotonergic subtype of major depressive disorder: A NeuroPharm-1 study.
Genome-wide association study identifies susceptibility loci for acute myeloid leukemia
Impact of tiered restrictions on human activities and the epidemiology of the second wave of COVID-19 in Italy
Detection of malignant peripheral nerve sheath tumors in patients with neurofibromatosis using aneuploidy and mutation identification in plasma
BIOCHEMICAL AND HAEMATOLOGICAL CHANGES ASSOCIATED WITH TRANSPLACENTAL CONGENITAL MALARIA IN KOGI STATE, NORTH CENTRAL NIGERIA
Detection and whole-genome sequencing of SARS-CoV-2 B.1.617.2 and B.1.351 variants of concern from Pakistan during the COVID-19 third wave
Polycystic ovary syndrome susceptibility loci inform disease etiological heterogeneity
Episodic memory deficits are associated with impaired insight in traumatic encephalopathy syndrome: Initial findings of the SNAP-CTE study
Safety and immunogenicity of BNT162b2 mRNA COVID-19 vaccine in Japanese patients after allogeneic stem cell transplantation.
Arterial Oxygen and Carbon Dioxide Tension and Acute Brain Injury in Extracorporeal Cardiopulmonary Resuscitation Patients: Analysis of the Extracorporeal Life Support Organization Registry
Quantifying within-school SARS-CoV-2 transmission and the impact of lateral flow testing in secondary schools in England
Physician-confirmed and administrative definitions of stroke in UK Biobank reflect the same underlying genetic trait.
Cohort study of Covid-19 vaccine effectiveness among healthcare workers in Finland, December 2020 - October 2021