Ключевые слова: aids, alphabet, bacterium, biohazard, biology, brush, cell, contagious, contamination, dangerous, disease, epidemic, flu, health, health care, hygiene, illness, infected, infection, infectious, influenza, initial, laboratory, letter, medical, microbe, microbiology, microscope, microscopic, organism, outbreak, pandemic, pathogen, pneumonia, protection, quarantine, research, respiratory, risk, science, sick, syndrome, vaccine, virology, virus,