Therefore the results of our study do not confirm either the recent report of Smith et al., who showed increased percentage of CD4+Foxp3+ and CD4+CD25+CD127- cells in BAL fluid of moderate to severe asthma [22] or the results of Hartl et al. who found a decreased percentage of CD4 + CD25high cells in BAL fluid of pediatric asthma patients [20]. Here, CD4 is linked to asthma.