Ключевые слова: 2, 19, 2019, africa, african, america, analyze, analyzing, antibody, bengal, blood, brazil, brazilian, care, cluster, coronavirus, cov, covid, covid19, exam, health, hybrid, india, indian, infection, laboratory, medical, mutation, nasopharyngeal, ncov, pcr, positive, rapid, realtime, rtpcr, sample, sars, sarscov2, south, strain, swab, test, testing, thai, thailand, type, uk, vaccine, variant, virus,