CD8A and infection: Increased CD8+ T cells in conjunction with the persistently high NKT cells and the lower percentages of CD8+ Tregs, especially in recovered donors who had severe symptoms and were hospitalized, could further strengthen the hypothesis that the prolonged (60 days after the infection) presence of CD8+ effectors probably reflects the necessity to modulate anti-viral responses against parts of the virus hidden in sanctuaries in this group of donors [30,41].