Ключевые слова: 3d, asian flu, avian influenza, background, bacteria, bacterial infection, bacterium, bird flu, cell, cells, concept, contagion, coronavirus, coronaviruses, danger, dangerous, disease, epidemic, flu, flu strain, health, health risk, human influenza, hygiene, illustration, infection, infectious, influenza, influenza background, medical, medicine, mers, microbe, microbiology, microscopic, outbreak, pandemic, pathogen, pathogenic, prevention, public health, quarantine, render, retrovirus, risk, science, scientific, strain, viral, virus,