Ключевые слова: blue, building, business, city, concept, contagion, contagious, coronavirus, covid 19, covid19, double, epidemic, exposure, factory, flu, flu season, hand, illness, industry, infection, infectious, influenza, light, outbreak, pandemic, pathogen, people, person, phone, quarantine, r, r nought, r0, rnought, shine, sick, smart, smartphone, spread, urban, viral, virus,