CD19 and infection: HAdV-7 positive patients had lower CD4+ T cell counts [861.6 (626.6-1305.6) vs 1456.0 (595.0-2064.2) cells/l], CD19+ B cell frequencies (654.7 ± 446.0 vs 711.9 ± 511.4 cells/l), and CD16+CD56+ NK cell numbers (358.2 ± 318.6 vs 390.5 ± 450.5 cells/l) than those with HAdV-3 infection, though these differences were not statistically significant.