Ключевые слова: 19, background, bacterial, building, cell, city, concept, contagious, corona, coronavirus, covid, danger, dangerous, disease, epidemic, fever, flu, h1n1, health, healthcare, healthy, ill, illness, infect, infection, influenza, invasion, life, medical, microbe, outbreak, pain, pandemic, pathogen, people, person, pestilence, pneumonia, pollution, population, respiratory, sars, sick, spread, symbol, town, urban, viral, virology, virus,