Low Toxoplasma antibody prevalence in serologic surveys of humans in southern Mexico.

Archivos de investigacion medica Pub Date : 1991-01-01
R S Goldsmith, I G Kagan, R Zárate, M A Reyes-González, J Cedeno-Ferreira
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Abstract

Antibody prevalence to Toxoplasma gondii among residents of a Pacific coastal region of Oaxaca State, Mexico is among low rates reported worldwide. From 60 small, rural communities, 3229 persons from ages 6 months to over 70 years provided blood specimens that were stored on filter papers. 124 (3.8%) of the eluates were seropositive (positive titer greater than 1:256) in the indirect hemagglutination test, and 43 (1.3%) had titers greater than 1:1024. Seropositive rates increased by age group and females were positive twice as often as males. There was no difference in rates for persons who lived at sea level, compared to those who lived between 600 and 1800 meters. In two small communities in which the number of persons tested were a large percentage of the total population, seropositive rates were 1.0 and 1.9%, respectively. The probable explanation for these low rates is the near absence of cats and paucity of meat in the diet. By contrast, sera tested from 479 persons living about 150 km to the east in the coastal, urban towns of Tehuantepec of Salina Cruz showed positive reactions among 122 (125.5%), and 71 (14.8%) had titers less than 1:1024. These people had a higher standard of living, more meat in their diet, and a few cats.

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墨西哥南部人类血清学调查中弓形虫抗体流行率低。
墨西哥瓦哈卡州太平洋沿岸地区居民中弓形虫抗体流行率是世界范围内报告的低水平之一。来自60个农村小社区的3229名年龄在6个月至70岁以上的人提供了保存在滤纸上的血液标本。间接血凝试验血清阳性124例(3.8%),阳性效价大于1:6 6 6,效价大于1:10 4 4例(1.3%)。血清阳性率随年龄组的增加而增加,女性的阳性率是男性的两倍。生活在海平面上的人和生活在600米到1800米之间的人相比,发病率没有差别。在接受检测的人数占总人口很大比例的两个小社区,血清阳性率分别为1.0和1.9%。对这些低比率的可能解释是几乎没有猫和饮食中缺乏肉。相比之下,居住在萨利纳克鲁兹特万特佩克沿海城镇以东约150公里处的479人的血清检测显示,122人(125.5%)呈阳性反应,71人(14.8%)的滴度低于1:1024。这些人的生活水平更高,他们的饮食中有更多的肉,还有一些猫。
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