Ключевые слова: asian flu, background, biohazard, biology, blood, cell, concept, contagious, coronavirinae, coronavirus, coronaviruses, covid19, danger, danger sign, diagnosis, disease, epidemic, epidemiology, fever, flu, globe, health, health care, health risk, illness, immunity, infect, infection, macro, medical, medicine, microbiology, pandemic, pathogen, pathogenic, sars, science, symptoms, vaccine, viral, virology, virus,