ACE2 and infection: Keeping this in mind, we cohoused SARS-CoV2-Foxo1fl/fl.CD4Cre+ mice with healthy ACE2.Tg mice for a longer period (12-day post infection) to see whether additional period allows an efficient transmission of SARS-CoV-2 to healthy cohoused ACE2.Tg mice as it does in case of infected ACE2.Tg mice cohoused with healthy ACE2.Tg mice.