Aseptic meningitis csf findings11/28/2023 In a subsequent surveillance study conducted during 1995 in laboratories serving all the acute care hospitals in 22 counties of four states (>10 million population) ( 3), the incidence of bacterial meningitis decreased dramatically, as a result of a vaccine-related decline in meningitis caused by H. The overall annual attack rate for bacterial meningitis, as defined by a surveillance study of 27 states in the United States from 1978 through 1981, was approximately 3.0 cases per 100,000 population, although there was variability based on age, race, and sex ( 1) the three most common meningeal pathogens (i.e., Haemophilus influenzae, Neisseria meningitides, and Streptococcus pneumoniae) accounted for more than 80% of cases. ETIOLOGY Bacterial Meningitisīacterial meningitis remains a very important disease worldwide ( 1, 2, 3, 4). Here, I will concentrate on the more common infectious causes of acute meningitis, with emphasis on the bacteria, viruses, and mycobacteria that most typically cause this syndrome. The acute meningitis syndrome may be caused by a wide variety of infectious agents and may also be a manifestation of noninfectious diseases. Acute meningitis is a clinical syndrome characterized by the onset of meningeal symptoms over the course of hours up to several days, and is defined by an abnormal number of white blood cells in cerebrospinal fluid (CSF).
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