The aim was to determine hematological and biochemical changes in children who are carriers of SARS-CoV-2. Unlike H1N1 influenza-like illness the predictive factors of SARS-CoV-2 in asymptomatic children (carriers of SARS-CoV-2) are distinctive ratio between lymphocytes and monocytes more than 2, with occasional eosinophila, and a dicrease in erythrocyte indices (MCH and MCV), and a rapid and strong increase in serum LDH value. The predictive factors are, presumably, useful for fast and cheap triage of children “from contact” until a PCR test result for SARS-CoV-2 arrives.