(F–J) absolute counts of CD3+CD4+CD45+ lymphocytes (F), CD3+CD8+CD45+ lymphocytes (G), CD3+CD16+CD56+CD45+ lymphocytes (H), CD3−CD16+CD56+CD45+ cells (I), and CD19+CD45+ lymphocytes (J) among patients with severe respiratory failure developing in the field of CAP caused by the 2009H1N1 influenza virus and COVID-19.