Ampicillin-Induced Morphological Alterations of <i>Haemophilus influenzae</i> Type b

Abstract

Inhibitory levels of ampicillin induced filamentation of growing Haemophilus influenzae ATCC 19418 within 30 min. Filaments became swollen and interrupted by regular periodic saccular outpouchings along the major axis. The degree of filamentation was dependent upon ampicillin concentration and time.