abstract
alert
antibiotics
asian flu
bacterial infection
bacterium
biology
cell
danger
diagnosis
disease
epidemic
flu
fraction
green
health
immunity
infect
infection
influenza
lethal
limbs
medical
medicine
microbe
microbiology
molecule
pandemic
parasites
particle
pathogen
pathogenic
pest
pneumonia
quarantine
red
science
shining
sickness
sprout
strain
substance
syndrome
treatment
vaccine
virology
virus