Ключевые слова: black, blue, clinic, clinical, closeup, disease, doctor, epidemic, filter, flu, global, hand, health, hospital, human, hygiene, illness, infected, infection, isolated, mask, medic, medical, medicine, novel, nurse, operation, pandemic, pneumonia, prevention, procedure, protection, protective, quarantine, respiratory, safety, sterile, surgery, surgical, syndrome, treatment, vaccine, virus,