2
19
2019
africa
african
america
analyze
analyzing
antibody
antigen
blood
brazil
brazilian
care
cluster
coronavirus
cov
covid
covid19
diagnosis
exam
health
india
indian
infection
laboratory
medical
mutation
nasopharyngeal
ncov
negative
pcr
positive
rapid
realtime
rt
rtpcr
sample
sars
sarscov2
south
strain
swab
test
testing
type
uk
vaccine
variant
virus