2019-ncov, background, blue background, bottle, care, clinic, corona virus, coronavirus, covid-19, covid19, cure, doctor, dose, effective, epidemic, health, health care, illness, immune, immunity, immunization, infection, influenza, injection, laboratory, liquid, medical, medication, medicine, needle, nurse, pandemic, patient, pfizer vaccine, pharmacy, prevention, protection, research, sars-cov-2, scientist, successful, test, treatment, vaccination, vaccine, vial, virus