Ключевые слова: 3d, allergy, background, biology, blood, cancer, cells, cold, contagion, contagious, disease, drug, epidemic, epidemiology, fever, flu, germ, hepatitis, hygiene, ill, illness, illustration, immune, infected, infection, medicine, microbiology, milecules, organism, pandemic, pathogen, research, scientific, sickness, vaccine, vessels, virology, virus,