The Theileria are apicomplexan parasites transmitted by ticks to vertebrate hosts. Most Theileria species exhibit some form of host or vector specificity, since under endemic conditions only a limited number of tick species act as vectors and not all vertebrate hosts are able to maintain a persistent carrier state. Data for Theileria sp. (buffalo) suggest host specificity for African buffalo (Syncerus caffer). However, T. sp. (buffalo) infections in cattle co-grazing with African buffalo have been reported in Kenya and schizonts were cultured from these infected cattle, raising questions regarding host specificity. A Corridor disease outbreak in 2013 on a ranch in South Africa where cattle co-grazed with Theileria parva and T. sp. (buffalo) infected buffalo presented the opportunity to investigate the possible carrier-state of T. sp. (buffalo) in cattle using real-time PCR analysis. Almost all buffalo (n = 19, 95%) were infected with T. sp. (buffalo) and showed CP values (22-20) indicative of high parasitemia similar to that observed for buffalo in endemic areas. Conversely, only ~14-27% cattle (n = 69, 100, 96) were positive with CP values (31-40) suggesting low parasitemia and a carrier state epidemiology different from African buffalo. Long term monitoring of T. sp. (buffalo) positive cattle showed that most cattle lost their parasitemia or presented fluctuating parasitemia around the PCR assay detection limit. A single splenectomized animal showed a persistent carrier state. The general trends and epidemiology observed in cattle infected with T. sp. (buffalo) are similar to that seen for buffalo-adapted T. parva, for which a defined carrier state in cattle has not yet been proven. The study suggests that cattle may be infected by T. sp. (buffalo) but are not definitive hosts that play an important part in the epidemiology of this parasite.

中文翻译：

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调查的泰勒菌种的载体状态。（水牛）在牛中。

泰勒虫是由tick传播到脊椎动物宿主的apicomplexan寄生虫。大多数泰勒虫属物种表现出某种形式的宿主或载体特异性，因为在地方病条件下，只有有限数量的tick科物种充当载体，而并非所有脊椎动物宿主都能够维持持久的携带者状态。泰勒菌属的数据。（buffalo）建议针对非洲水牛（Syncerus caffer）的宿主特异性。然而，T。肯尼亚已有与非洲水牛一起放牧的牛感染（buffalo）感染，并从这些被感染的牛中培养出了裂殖子，这引起了寄主特异性的质疑。2013年在南非的一个牧场上发生了一次走廊疾病暴发，那里的牛与Theileria parva和T. sp。一起被放牧。（buffalo）感染的buffalo提供了研究T. sp。可能的携带者状态的机会。使用实时PCR分析牛中的（水牛）。几乎所有的水牛（n = 19，95％）都被T. sp。（水牛）并显示CP值（22-20），表明高寄生虫病与流行地区的水牛相似。相反，只有约14-27％的牛（n = 69、100、96）为阳性，CP值（31-40）表明寄生虫病低，且携带者流行病学与非洲水牛不同。长期监测的T. sp。（buffalo）阳性牛显示大多数牛失去了寄生虫病或在PCR分析检测极限附近呈现波动性寄生虫病。一只脾切除的动物表现出持续的携带者状态。在感染T. sp。的牛中观察到总体趋势和流行病学。（buffalo）与适应水牛的T. parva所见的相似，为此，尚未证明牛的定义携带者状态。研究表明，牛可能被T.sp.感染。（水牛），但不是确定的宿主，在此寄生虫的流行病学中起重要作用。