Ключевые слова: alert, america, asia, attention, background, bacterium, biohazard, caution, concept, contagious, contamination, continent, corona, coronavirus, country, covid19, danger, dangerous, disease, earth, epidemic, fever, flu, geography, global, health, illustration, immunity, infection, infographic, location, lung, map, medical, medicine, pandemic, pneumonia, quarantine, risk, science, symptom, vaccine, virus, warning, world, world map,