Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: Coronavirus Disease 2019 (COVID-19) Vaccine Boosting in Persons Already Protected by Natural or Vaccine-Induced Immunity
Diagnosing COVID-19 in human serum using Raman spectroscopy: a preliminary study
COVID-19 third wave experience in India, a survey of 5971 adults
Altered anterior default mode network dynamics in progressive multiple sclerosis
Six-month Neurological and Psychiatric Outcomes in 236,379 Survivors of COVID-19
Epigenome-wide Association Study of Alcohol Use Disorder in Five Brain Regions
Double trouble? When a pandemic and seasonal virus collide
Design of optical cavity for air sanification through ultraviolet germicidal irradiation
HDMAX2: A framework for High Dimensional Mediation Analysis with application to maternal smoking, placental DNA methylation and birth outcomes
From first to second wave: follow-up of the prospective Covid-19 cohort (KoCo19) in Munich (Germany)
The therapeutic effect of intra-articular facet joint injection with normal saline as a comparator for chronic low back pain: a systematic review and meta-analysis
Gaining Control of Combination Cancer Treatment Risk by Incorporating Cost and Value Data into the Drug Selection Process at the Point-of-Care
Risk of death among teachers in England and Wales during the Covid19 pandemic
mRNA Vaccine Effectiveness against COVID-19 among Symptomatic Outpatients Aged >=16 Years in the United States, February to May 2021
Community-level face mask usage in Boston, MA
Chronic Disease and Workforce Participation Among Medicaid Enrollees Over 50: The Potential Impact of Medicaid Work Requirements Post-COVID-19
A neonatal ward strengthening program improves survival for neonates treated with CPAP at district hospitals in Malawi
Quantitative insights into effects of intrapartum antibiotics and birth mode on infant gut microbiota in relation to well-being during the first year of life
Apple Watch and Withings Evaluation of Symptoms, Treatment, and Rhythm in those Undergoing Cardioversion (AWE STRUCk): A Pragmatic Randomized Controlled Trial
Epithelial-to-mesenchymal transition lowers the cholesterol pathway, wich influences colon tumors differentiation.
On Multiply Robust Mendelian Randomization (MR2) With Many Invalid Genetic Instruments
Nutrition Policies in Germany: A Systematic Assessment with the Food Environment Policy Index (Food-EPI)
Prospective cohort study of workers diagnosed with COVID-19 and subsequent unemployment
How does the local area deprivation influence life chances for children in poverty in Wales: A record linkage cohort study
Vaccination and herd immunity thresholds in heterogeneous populations
The effects of modifiable maternal pregnancy risk factors on molar-incisor hypomineralisation: A negative control study