Ключевые слова: 3d, aids, asian flu, background, bacteria, bird flu, cell, clinic, cold, concept, contagion, coronavirus, diagnosis, disease, doctor, epidemic, flu, flu strain, germ, health, hiv, hygiene, illness, illustration, infection, influenza, lethal, medical, microbe, microbiology, new, pandemic, pathogen, pneumonia, realistic, research, respiratory, sars, science, sickness, symptoms, transmission, transmit, vaccine, viral, virology, virus,