Ключевые слова: 19, antigen, background, bacteria, care, clinic, concept, contagion, corona, coronavirus, covid19, danger, diagnosis, disease, doctor, flu, hand, health, health care, healthy, hospital, illness, infection, influenza, laboratory, medical, medicine, pandemic, people, pneumonia, prevention, protection, rapid, rapid test, research, respiratory, science, self, self test, set, show, sick, sickness, sign, stethoscope, test, treatment, vaccine, virus, white,