Ключевые слова: bacteria, bacteriology, blood, body, care, cell, chickenpox, communicable, contagion, contagious, contamination, dangerous, disease, ebola, epidemic, epidemiology, fever, flu, flu virus, germ, germs, h1n1, hepatitis, hiv, human, hygiene, illness, immune, infected, infection, infectious, infectious disease, influenza, measles, mers, microorganism, microscopic, mycobacterium, pandemic, retrovirus, sars, vaccine, viral, viral disease, viral infection, virus, virus sign,