INFECTIONS due to Hemophilus influenzae type B occur frequently in children. Infection in adults is uncommon and usually associated with lowered resistance as in agammaglobulinemia, diabetes mellitus, alcoholism, nephrotic syndrome, and trauma.1 The low incidence to infection in the neonate is due to passive transfer of antibody,2 in the adult previous contact gives rise to specific antibody. The H influenzae type B causes meningitis,3 pneumonia,4,5 endocarditis,6-8 pericarditis,9 laryngitis,10 or septic arthritis. There are six previous reports of septic arthritis (Table 1). The present study reports two additional cases, one associated with hypercalcemia. Report of Cases Case 1. —First Admission. —A 37-year-old single, Negro trashman was admitted to Strong Memorial Hospital on Oct 13, 1964, because of pain in the right hip. Thirty days before while the patient was at work his right ilium was struck anteriorly by a garbage can as he negotiated a narrow passageway. He had immediate pain