It most commonly causes asymptomatic nasopharyngeal carriage but on occasion causes invasive disease ( 10, 58, 150). meningitidis is a gram-negative diplococcus that is a strict human pathogen. monocytogenes, and group B streptococcus because of the use of intrapartum chemoprophylaxis in selected women ( 3, 312, 341, 384). The role of the meningococcus as a cause of bacterial meningitis has become more pronounced in recent years with the declines in meningitis caused by Haemophilus influenzae type b and Streptococcus pneumoniae because of the introduction of new conjugate vaccines, Listeria because of efforts to reduce the contamination of food with L. ![]() ![]() Neisseria meningitidis is a leading cause of bacterial meningitis and other invasive bacterial infections, both in the United States and worldwide ( 244, 300, 314).
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