National Institute of Virology - Kerala unit, Alappuzha, Kerala, India.
Med Vet Entomol. 2022 Mar;36(1):38-42. doi: 10.1111/mve.12549. Epub 2021 Sep 23.
Kyasanur forest disease (KFD) is a tick-borne zoonotic viral disease with an estimated case fatality rate of 3% to 5% in humans. The KFD virus is transmitted to both humans and animals by infected ticks, primarily the Haemaphysalis species. Our study was undertaken following reports of five confirmed cases and three deaths due to KFD in Malappuram district of Kerala in 2014 to determine the diversity of Ixodidae ticks on vegetation and their possible infection with the KFD virus. Overall, 3502 hard ticks belonging to three genera and eight species were collected from two forest divisions. Haemaphysalis was the predominant tick species (92.72%). Tick positivity for the KFD virus was 4 (5.33%) of 75 pools of ticks tested. Kyasanur forest disease viral RNA was detected from the genera Haemaphysalis and Amblyomma. The KFD virus was detected in 2 of 35 pools (5.71%) of Haemaphysalis spinigera, 1 of 30 pools (3.33%) of Haemaphysalis turturis, and 1 of 3 pools (3.33%) of Amblyomma integrum from the south forest division. The ticks reached their peak density between December and February and then decreased from the end of May. The temperature in the area ranges from 28°C to 30°C, which is suitable for tick survival.
基孔肯雅热（KFD）是一种由蜱传播的人畜共患病毒性疾病，人类的估计病死率为 3%至 5%。基孔肯雅热病毒通过受感染的蜱，主要是 Haemaphysalis 种类，在人类和动物之间传播。我们的研究是在 2014 年喀拉拉邦马拉普兰区报告了五例确诊病例和三例基孔肯雅热死亡病例后进行的，目的是确定植被上的硬蜱属蜱的多样性及其可能感染基孔肯雅热病毒的情况。总体而言，从两个森林区共收集到属于三个属和八个种的 3502 只硬蜱。Haemaphysalis 是主要的蜱种（92.72%）。在 75 个蜱虫样本池中，有 4 个（5.33%）对基孔肯雅热病毒呈阳性。从 Haemaphysalis 和 Amblyomma 属检测到基孔肯雅热病毒 RNA。在南森林区的 35 个 Haemaphysalis spinigera 样本池（5.71%）、30 个 Haemaphysalis turturis 样本池（3.33%）和 3 个 Amblyomma integrum 样本池（3.33%）中检测到基孔肯雅热病毒。蜱虫的密度峰值出现在 12 月至 2 月之间，然后从 5 月底开始下降。该地区的温度范围在 28°C 至 30°C，适合蜱虫生存。
