Seasonal abundance of Ornithodoros (O.) savignyi and prevalence of infection with Borrelia spirochetes in Egypt.
Seasonal abundance of Ornithodoros (O.) savignyi and prevalence of infection with Borrelia spirochetes in Egypt.
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发表时间：
2000-08
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通讯作者：
N. Helmy
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作者：
N. Helmy
1996年8月至1997年7月在吉萨省Dahshore村调查了萨维氏鸟的季节动态以及蜱、家畜和人感染伯氏疏螺旋体的情况。6 - 10月成蜱密度高，8月和9月最高；10 - 5月以成虫为主（58.6% ~ 80.0%），以1月最多，其余时间以未成虫为主（51.3% ~ 65.8%），9月为高峰。1202只蜱中检出螺旋体427只（35.5%）。成虫和未成虫年感染率在34.4% ~ 36.9%之间，幼虫、若虫、雌雄之间无显著差异。在1396份人血清和553份宿主动物血清中，伯氏疏螺旋体抗原抗体阳性309份（22.1%）和157份（28.4%），其中骆驼感染率最高（47.8%），其次是绵羊（23.8%）、山羊（18.0%）和奶牛（16.0%），水牛最低（10.9%）。蜱虫种群中伯氏疏螺旋体感染流行率的变化与人、骆驼抗体流行率的变化以及蜱虫种群密度的变化呈正相关。4个事件在冬季和早春最低，随后增加，在夏季和早秋（7 ~ 9月）达到最大值。
The seasonal dynamics of Ornithodoros (O.) savignyi and infection with Borrelia sp. in the tick, domestic animals and man were investigated in the village of Dahshore, Giza governorate from August 1996 through July 1997. The tick population densities of adults and immatures were high during the period from June to October with maximum levels in August and September respectively. Adults predominated (58.6%-80.0%) in October to May with the highest abundance in January while immatures prevailed (51.3%-65.8%) during the rest of the year reaching a peak in September. Of 1202 tick examined, the spirochetes were detected in 427 (35.5%). The annual infection rate in adults and immatures varied from 34.4%-36.9% with no significant difference among larvae, nymphs, males and females. Of 1396 sera from man and 553 sera from host animals tested, 309 (22.1%) and 157 (28.4%), respectively, were reactive for antibody to Borrelia sp. antigen with the highest infection rate in camel (47.8%), followed by sheep (23.8%), goat (18.0%) and cow (16.0%), then the least in buffalo (10.9%). Changes in prevalence of Borrelia infection in the tick population correlated positively with changes in antibody prevalence in man and camel and with changes in the tick population density. The four events were lowest in winter and early spring and increased afterward to reach maxima during summer or the early fall (July-September).