abstract
antibiotics
background
bacteria
bacterial infection
bacterium
biology
concept
contagious
contamination
corona
corona virus disease
coronavirinae
coronavirus
coronavirus analysis
coronavirus disease
covid19
covid2019
dangerous
death
diagnosis
disease
epidemic
fever
flu
health
illness
infect
infection
infectious
influenza background
medical
medicine
microbiology
microorganism
microscopic
organism
pandemic
pathogen
pathogenic
quarantine
retrovirus
sars
science
sick
vaccine
viral
virology
virus