inclusion criteria: * 1) aged between 1-month to 18-year old (boy or girl), 2) definitive or clinical diagnosis of severe acute respiratory syndrome (sars)-like coronavirus 2 (sars-cov-2) infection (by either a positive sars-cov-2 polymerase chain reaction (pcr) test or a suggestive computed tomography (ct) scan, 3) no history or evidence of cancer or renal, hepatic, endocrine or viral disorders (including hiv/aids), 4) no history of supplementation either with vitamin a (va) or with a multivitamin containing va within the last 4 months, and 5) not participated in other clinical trials.

inclusion criteria: * 1) aged between 1-month to 18-year old (boy or girl), 2) definitive or clinical diagnosis of severe acute respiratory syndrome (sars)-like coronavirus 2 (sars-cov-2) infection (by either a positive sars-cov-2 polymerase chain reaction (pcr) test or a suggestive computed tomography (ct) scan, 3) no history or evidence of cancer or renal, hepatic, endocrine or viral disorders (including hiv/aids), 4) no history of supplementation either with vitamin a (va) or with a multivitamin containing va within the last 4 months, and 5) not participated in other clinical trials.

inclusion criteria: - 1) aged between 1-month to 18-year old (boy or girl), 2) definitive or clinical diagnosis of severe acute respiratory syndrome (sars)-like coronavirus 2 (sars-cov-2) infection (by either a positive sars-cov-2 polymerase chain reaction (pcr) test or a suggestive computed tomography (ct) scan, 3) no history or evidence of cancer or renal, hepatic, endocrine or viral disorders (including hiv/aids), 4) no history of supplementation either with vitamin a (va) or with a multivitamin containing va within the last 4 months, and 5) not participated in other clinical trials.

inclusion criteria: - 1) aged between 1-month to 18-year old (boy or girl), 2) definitive or clinical diagnosis of severe acute respiratory syndrome (sars)-like coronavirus 2 (sars-cov-2) infection (by either a positive sars-cov-2 polymerase chain reaction (pcr) test or a suggestive computed tomography (ct) scan, 3) no history or evidence of cancer or renal, hepatic, endocrine or viral disorders (including hiv/aids), 4) no history of supplementation either with vitamin a (va) or with a multivitamin containing va within the last 4 months, and 5) not participated in other clinical trials.

inclusion criteria: - 1) aged between 1-month to 18-year old (boy or girl), 2) definitive or clinical diagnosis of sars-cov-2 infection (by either a positive sars-cov-2 polymerase chain reaction (pcr) test or a suggestive computed tomography (ct) scan, 3) no history or evidence of cancer or renal, hepatic, endocrine or viral disorders (including hiv/aids), 4) no history of supplementation either with vitamin a (va) or with a multivitamin containing va within the last 4 months, and 5) not participated in other clinical trials.

inclusion criteria: - 1) aged between 1-month to 18-year old (boy or girl), 2) definitive or clinical diagnosis of sars-cov-2 infection (by either a positive sars-cov-2 polymerase chain reaction (pcr) test or a suggestive computed tomography (ct) scan, 3) no history or evidence of cancer or renal, hepatic, endocrine or viral disorders (including hiv/aids), 4) no history of supplementation either with vitamin a (va) or with a multivitamin containing va within the last 4 months, and 5) not participated in other clinical trials.