biohazardous substance
bottle
care
caucasian
chemical
chemistry
closeup
cold and flu
coronavirus
covid19
covid19 vaccine
doctor
epidemic
fever
gloves
hand
health care
illness
illness prevention
infectious disease
injecting
injection
isolated
medical instrument
medical research
microbiology
occupation
one person
pandemic
people
protection
research
risk
science
scientific experiment
scientist
severe acute respiratory syndrome
syringe
test tube
vaccination
vaccine
vial
viral
virus