Ключевые слова: abstract, aids, antibody, background, bacteria, biology, cancer, cell, cough, cure, death, disease, fever, flu, germs, healthcare, hiv, hygiene, ill, illness, immune, infection, influenza, layout, medical, micro, microbe, microbiology, microscopic, ncov, outbreak, pandemic, parasite, prevention, research, respiratory, science, scientific, sick, vaccine, viral, virus, wallpaper,