Ключевые слова: abstract, backgrounds, bacterium, biological cell, biology, blue, circle, closeup, cold and flu, colors, coronavirus, covid19, danger, design, disease vector, epidemic, fever, healthcare and medicine, horizontal, illness, illness prevention, illustration, immune system, infectious disease, medicine, micro organism, microbiology, modern, no people, pain, pandemic illness, pathogen, pattern, pneumonia, repetition, respiratory system, science, seamless pattern, severe acute respiratory syndrome, square composition, symbol, symptom, text, tileable pattern, unhygienic, viral infection, viral shedding, virus,