Ключевые слова: allergy, background, blue, breathing, care, corona, coughing, covid, covid19, disease, disposable, doctor, epidemic, equipment, fever, filter, flu, gauze, health, health care, hospital, hygiene, mask, medicine, nvoc, outbreak, paper, protection, protective, respirator, sars, sick, sneezing, surgeon, surgical, symptom, threedimensional, virology, virus, white,