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COMPARISON OF FILTRATION STAINING (BELL) AND THICK SMEAR (KATO) FOR THE DETECTION AND QUANTITATION OF SCHISTOSOMA MANSONI EGGS IN FAECES
Autor
Afiliación
Harvard School of Public Health. Department of Tropical Public Health. Boston, USA
Harvard School of Public Health. Department of Tropical Public Health. Boston, USA
Harvard School of Public Health. Department of Tropical Public Health. Boston, USA
Universidade Federal da Bahia. Departamento de Medicina Preventiva. Salvador, BA, Brasil
Universidade Federal da Bahia. Departamento de Medicina Preventiva. Salvador, BA, Brasil
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
Harvard School of Public Health. Department of Tropical Public Health. Boston, USA
Harvard School of Public Health. Department of Tropical Public Health. Boston, USA
Universidade Federal da Bahia. Departamento de Medicina Preventiva. Salvador, BA, Brasil
Universidade Federal da Bahia. Departamento de Medicina Preventiva. Salvador, BA, Brasil
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
Resumen en ingles
We compare results of one Bell and one Kato-Katz
examination performed on each of 315 stool specimens
from residents in an area in north-eastern Brazil
endemic for schistosomiasis mansoni. The prevalence
of schistosome infection detected by the Bell technique
was 76% and by the Kato-Katz technique was
63%. 81% (44/54) of the infections missed by a
Kato-Katz smear were light infections (one to 50 epg
range by Bell e xamination). Over-all, 55% (44/80) of
stools in this egg count range by the Bell technique
were negative xn a single-Kat&Katz smear. T-his
implies that five Kato-Katz smears per stool would
ensure a 95% probability (O-55’ x 100) of detecting
such light infections. However, a single Kato-Katz
smear detected eggs in 97% (124/128) of stools with a
Bell count >l&>pg. For ‘stools &sitive by both
methods the egg counts per gram of stool were higher
(p<O*001) by Kato-Katz examination. Geometric
mean egg counts for the infected population were
199 epg by the Kato-Katz and 92 epg by the Bell
methods. 64% (59 v. 36) more persons were classified
as heavily infected (>4OOepg) by the Kato-Katz
method than by the Bell method. The differing
measurements of schistosome infection obtained with
the Bell and Kato-Katz methods must be considered
when comparing data on morbidity-infection relationships.
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