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In volume 44 of Pediatrics several articles reporting information from the authors' experience ence or from the literature about infectious diseases have failed to classify Hemophilus in fluenzae organisms by groups1-4. It is probably safe to assume pathogenicity of such organisms regardless of their group if they are recovered in pure culture from an inflammatory exudate. Isn't it true, however, that most Hemophilus infections are due to group b Hemophilus influenzae; that pathogenicity is difficult to assign with certainty to other types of Hemophilus organisms; and that many healthy individuals harbor Hemophilus influenzae in their upper respiratory passages?5