The micro-organism Mima polymorpha was first isolated in 1939 by DeBord1 from the urethral discharge of patients being studied for resistant gonorrhea. This Gramnegative rod, with a marked tendency to pleomorphism, was aptly named by him because of its ability to mimic other Gramnegative bacteria, particularly those of the Neisseria genus. M. polymorpha remained primarily the interest of the bacteriologist until 1948, at which time DeBord2 reported a case of meningitis in which this microorganism was identified in the cerebrospinal fluid. Since then there have been five reported cases of meningitis due to M. polymorpha,3-6 but only one of these occurred in a patient of the pediatric age group.3 The purpose of this case report is to call the attention of those caring for children to this micro-organism as an etiologic agent in meningitis, emphasizing its ability to mimic other infections and the variability of findings