adult
analysis
antibody
antigen
background
blood
blue
care
cell
clinic
closeup
convalescent
crisis
diagnostic
disease
doctor
drop
epidemiologist
equipment
female
finger
glove
hand
health
hospital
immunity
kit
lab
laboratory
medical
negative
pandemic
patient
people
pipette
plasma
positive
prick
result
sample
scientist
serology
table
taking
test
virus
woman