Ключевые слова: 3d, alert, background, biohazard, biology, cell, contagious, dangerous, death, disease, doctor, epidemic, fever, flu, health, health care, illness, illustration, infect, infection, infectious, medical, medicine, microbiology, outbreak, pandemic, pathogen, people, pneumonia, quarantine, sars, science, sickness, vaccine, viral, virology, virus, warning,