CD4 and infection: Interestingly, there was no association between convalescent lymphocyte subset counts and severity of initial infection when comparing those managed as an outpatient, at ward level, and in ICU (naïve CD4+ T cells χ2 = 0.31, p=0.86, naïve CD8+ T cells χ2 = 4.12, p=0.13, effector CD8+ T cells χ2 = 0.29, p=0.19, activated CD4+ T cells χ2 = 0.28, p=0.87, activated CD8+ T cells χ2 = 0.29, p=0.07).