"Q" fever, a new fever entity: clinical features, diagnosis and laboratory investigation.
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As the serological test of streptococcal infection, the measurement of anti-exotoxin antibodies such as ASO is widely practiced. M protein of the cell wall of group A streptococcus has type specificity. To detect the anti M protein antibody is very significant, but it is not easy to apply this to clinical practice because there are many types and because of the difficulty of purifying M protein. C polypeptide has group specificity, so the measurement of the antibody to C polypeptide is very important as the serological test of group A streptococcus.
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The causative agents of rickettsial diseases (Rickettsia conorii, R. typhi, and Coxiella burnetii) have been reported throughout the African continent. However, there have been no reports on epidemiologic surveys of these infections in Zambia. This study was designed to clarify the prevalence of three rickettsioses in 377 humans in Zambia. The seroprevalence of antibodies against R. conorii, R. typhi, and C. burnetii was 16.7%, 5.0%, and 8.2%, respectively. The rates of antibody positivity against R. conorii and C. burnetii were higher in the eastern (23.1% and 11.8%) and western (16.8% and 7.4%) areas of Zambia than in the northern (3.0% and 3.0%) area of this country. There was little difference among the three areas in the distribution of antibodies against R. typhi. Since cattle breeding is more extensive in the western and eastern areas than in the northern area, it is thought that cattle-breeding areas are foci of R. conorii and C. burnetii infections in Zambia.
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