Meningococcal meningitis and carriage in western Zaire: a hypoendemic zone related to climate?
An analysis of bacteria recovered from cerebrospinal fluid over a 16-year period at a rural hospital in western Zaire showed that Neisseria meningitidis accounted for only five (2.2%) isolates. A survey of naso-pharyngeal colonisation with N. meningitidis in 378 healthy children was undertaken to distinguish whether this low frequency was due to lack of carriage or, by inference, lack of the co-factors necessary to permit invasive disease. N. meningitidis was recovered from only three (0.78%) of the children. All isolates were non-typable strains of low pathogenicity. A review of studies examining the aetiology of bacterial meningitis and the geographical location of epidemics of meningococcal meningitis in and around Zaire reveals a 'hypoendemic zone', the limits of which correlate well with the area in which mean absolute humidity remains above 10 g m-3 of air throughout the year. Continuous high absolute humidity appears to reduce the transmission of meningococci.
Cheesbrough
J S
JS
Department of Medical Microbiology, University of Liverpool.
Morse
A P
AP
Green
S D
SD
D000293:Adolescent; D002353:Carrier State / Q000453:epidemiology* / Q000382:microbiology; D002648:Child; D015023:Democratic Republic of the Congo / Q000453:epidemiology; D006801:Humans; D006813:Humidity; D015994:Incidence; D007223:Infant; D008585:Meningitis, Meningococcal / Q000134:cerebrospinal fluid / Q000453:epidemiology* / Q000382:microbiology / Q000635:transmission; D017817:Nasal Lavage Fluid / Q000382:microbiology; D009345:Neisseria meningitidis / Q000302:isolation & purification; D012621:Seasons