Ключевые слова: bacterial, biohazard, biological, cold, concept, contagion, contagious, contamination, dangerous, disease, diseases, emergency, fever, flu, germs, health, health care, healthcare, human, ill, infectious, medicine, outbreak, pain, parasite, parasitic, pathogen, plague, protection, research, science, scientific, scientist, sick, spread, technology, toxic, unhygienic, vaccination, viral, virus,