Dzul-Rosado Karla, Lugo-Caballero Cesar, Tello-Martin Raul, López-Avila Karina, Zavala-Castro Jorge
Center of Research and Regional Studies Dr Hideyo Noguchi, Autonomous University of Yucatan. Av. Itzáes and 59th street, number490, Mérida, Yucatán. Postal code 97000, Mexico.
Open Vet J. 2017;7(2):165-169. doi: 10.4314/ovj.v7i2.14. Epub 2017 Jun 11.
Murine typhus is a rickettsiosis caused by , whose transmission is carried out by rat fleas in urban settlements as classically known, but it also has been related to cat fleas in a sub-urban alternative cycle that has been suggested by recent reports. These studies remarks that in addition to rats, other animals like cats, opossums and dogs could be implied in the transmission of as infected fleas obtained from serologically positive animals have been detected in samples from endemic areas. In Mexico, the higher number of murine typhus cases have been detected in the Yucatan peninsula, which includes a great southeastern region of Mexico that shows ecologic characteristics similar to the sub-urban alternative cycle recently described in Texas and California at the United States. To find out which are the particular ecologic characteristics of murine typhus transmission in this region, we analyzed blood and ticks obtained from domestic dogs by molecular approaches, demonstrating that both samples were infected by . Following this, we obtained isolates that were analyzed by genetic sequencing to corroborate this infection in 100% of the analyzed samples. This evidence suggests for the first time that ticks and dogs could be actively participating in the transmission of murine typhus, in a role that requires further studies for its precise description.
鼠型斑疹伤寒是一种由[病原体名称未给出]引起的立克次体病，其传播通常由城市地区的鼠蚤进行，但最近的报告表明，在一种城郊交替循环中，猫蚤也与之有关。这些研究指出，除了老鼠之外，其他动物如猫、负鼠和狗也可能参与传播，因为在流行地区的样本中已检测到从血清学阳性动物身上获得的感染性跳蚤。在墨西哥，尤卡坦半岛检测到的鼠型斑疹伤寒病例数量最多，该半岛包括墨西哥东南部的大片地区，其生态特征与美国得克萨斯州和加利福尼亚州最近描述的城郊交替循环相似。为了找出该地区鼠型斑疹伤寒传播的特殊生态特征，我们通过分子方法分析了从家犬身上采集的血液和蜱虫，结果表明这两种样本都感染了[病原体名称未给出]。随后，我们获得了分离株，并通过基因测序进行分析，以证实100%的分析样本都存在这种感染。这一证据首次表明，蜱虫和狗可能积极参与鼠型斑疹伤寒的传播，其作用需要进一步研究以进行精确描述。
