Medicine and Dentistry
Infection
100%
Cohort Analysis
100%
Reinfection
100%
COVID-19
100%
Severe Acute Respiratory Syndrome Coronavirus 2
91%
Disease
58%
Symptom
16%
Health Care
16%
Immune Response
16%
Medical History
16%
Demography
16%
Reverse Transcription Polymerase Chain Reaction
16%
Nose Smear
16%
COVID-19 Vaccine
16%
Cohort Effect
8%
Occupational Exposure
8%
Molecular Diagnosis
8%
Quantitative Reverse Transcription Polymerase Chain Reaction
8%
American Indian
8%
Personal Protective Equipment
8%
COVID-19 Vaccination
8%
Pharmacology, Toxicology and Pharmaceutical Science
Infection
100%
Cohort Study
100%
Reinfection
100%
SARS Coronavirus
91%
Disease
58%
Vaccination Policy
25%
Symptom
16%
COVID-19 Vaccine
16%
Medical History
8%
Occupational Exposure
8%
Keyphrases
COVID-19 Reinfection
100%
Healthcare Emergency
33%
Equipment Risk
11%
Quarterly Surveys
11%
Self-collected Nasal Swabs
11%
Mathematics
Healthcare
100%
Study Objective
50%
Nursing and Health Professions
Reinfection
100%
Nose Smear
16%