Although some studies did not find differences in the percentage of Th1 cells according to COVID-19 severity (29, 66), in our cohort of people with PCC the levels of CD4+ Th1 cells were lower than in people who recovered from mild COVID-19 and more similar to those from people who presented severe and critical forms of acute COVID-19, in which Th1 subset is usually underrepresented (73, 74). The gene discussed is CD4; the disease is COVID-19.