alert
bacteria
biology
care
caution
confirmed
contagious
contamination
coronavirus
covid
covid19
death
diagnosis
disease
epidemic
fever
flu
global
health
illness
immunity
infected
infection
influenza
medical
microbe
outbreak
pandemic
pathogen
pneumonia
prevention
quarantine
respiratory
risk
science
sickness
spread
stop
symptoms
vaccine
viral
virology
virus
warning
world