Abstract
INFECTIONS with Haemophilus influenzae in children constitute a serious problem. In adults, because of the presence of large amounts of potent bactericidal antibodies in the blood, this organism is much less frequently an instigator of disease processes.1 During the pandemic of influenza in 1918, however, there were many cases in which the hemophilic organism was isolated from the lungs. It therefore appears that the normally present humoral protection against H. influenzae may break down under certain conditions and that this type of infection may be of great importance in all age groups. In children, there is no part of the . . .