Ключевые слова: aids, analysis, background, biochemical, biochemistry, blood, blue, care, chemical, container, cork, covid, disease, donor, female, general, glass, hand, health, hematology, hepatitis, hospital, infection, keep, laboratory, liquid, medical, negative, nobody, positive, procedure, reaction, red, result, rh factor, rhesus, sample, science, sterile, technology, test, test tube, transfusion, treatment, virus,