SFTPA1 and COVID-19: The mean expression values for the studied genes across the groups were as follows: SFTPA1 showed levels of 0.0461 ± 0.0270 in the asymptomatic COVID-19-positive patient group, 0.0271 ± 0.0069 in the mild group, and 0.0199 ± 0.0136 in the severe group.