antibiotics
bacterial infection
bacterium
biology
bird flu
concept
danger
diagnosis
disease
epidemic
fever
flu
flu strain
health
illness
immunity
infect
infection
influenza
influenza background
medical
medicine
microbiology
new strain
outbreak
pandemic
pathogen
pathogenic
pathology
pneumonia
prevention
protection
respiratory
sars
science
sickness
superbug
symptoms
syndrome
treatment
vaccine
viral
virology
virus