aggressive
antibody
attack
bacteria
biology
cell
clinic
contagion
contamination
cough
cov
covid
crown
cure
danger
dangerous
defend
defense
disease
diseased
fight
flu
hazard
health
hospital
ill
infection
infectious
magnification
medic
microscope
pain
patient
pneumonia
precaution
preserve
protect
protection
respiratory
rna
sars
spike
therapy
treatment
unhealthy
virus