Ключевые слова: alley, background, bacteria, bio, biochemical, biohazard, biology, care, carelessness, caution, city, closeup, contaminated, contamination, danger, disposal, face, footway, garbage, health, hygiene, hygienic, infected, infection, man, mask, medical, medicine, nature, negligence, outbreak, pandemic, park, people, plastic, pollution, protection, protective, rubbish, sidewalk, street, symbol, trash, trash can, used, viruses, waste,