Detection of Francisella tularensis in Alaskan mosquitoes (Diptera: Culicidae) and assessment of a laboratory model for transmission.

Detection of Francisella tularensis in Alaskan mosquitoes (Diptera: Culicidae) and assessment of a laboratory model for transmission.
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DOI:
10.1603/me09192
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发表时间:
2010-07
影响因子:
2.1
通讯作者:
Hueffer K
Hueffer K
中科院分区:
农林科学3区
文献类型:
--
作者:
Triebenbach AN;Vogl SJ;Lotspeich-Cole L;Sikes DS;Happ GM;Hueffer K

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Tularemia is a zoonotic disease caused by the Category A bioterrorism agent Francisella tularensis. In Scandinavia, tularemia transmission by mosquitoes has been widely cited in the literature. We tested >2,500 mosquitoes captured in Alaska and found Francisella DNA in 30% of pooled samples. To examine the potential for transmission of Francisella by mosquitoes, we developed a mosquito model of Francisella infection. Larvae of Anopheles gambiae Giles and Aedes aegypti (L.) readily ingest F. tularensis but do not efficiently transfer infective doses of the bacterium to the pupal or adult stage. After a bloodmeal containing Francisella, adult female An. gambiae and Ae. aegypti retained detectable levels of Francisella DNA for 3 d, but when they took a second bloodmeal, the mammalian host was not infected. This study suggests that although Francisella DNA can be detected in a significant portion of wild-caught mosquitoes, transmission of Francisella is either very inefficient or is species dependent for the Francisella strain or the arthropod vector.
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