Study design
This was a retrospective analysis of a single center, cohort study, performed between Feb 20, 2020 and April 20, 2020 in patients with Covid-19 infection, at Ziaeian Hospital, a center for pandemic Covid-19 infected patients, Tehran, Iran.
This study including 285 confirmed, Covid-19 infected patients who were admitted to this hospital during two months and received two different therapeutic regimens according to the guidelines issued by Iranian Ministry of Health and Medical Education (first edition(Iranian Ministry of health and Medical Education , 28 Feb 2020), fifth edition(Iranian Ministry of Health and Medical Education , 25 march 2020)).The first group including 120 inpatients between Feb 20, 2020 and March 15, 2020 who received Oseltamivir in addition with routine regimen (combination group) (Iranian Ministry of health and Medical Education , 28 Feb 2020).The second group including 165 patients between March 20,2020 and April 20,2020 received routine regimen alone (control group) (Iranian Ministry of Health and Medical Education , 25 march 2020).