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    Molecular Identification of Vector Mosquitoes of Dirofilariasis in Matale District, Sri Lanka

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    Date
    2023-09
    Author
    Ranasinghe, HAK
    Rathnayaka, HGNT
    Pannila, PMB
    Wickramarathne, DV
    Kudhoos, NS
    Kasurika, PWD
    Perera, EHL
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    Abstract
    Dirofilariasis is a vector-borne parasitic disease with a worldwide distribution. In Sri Lanka, only one study has been recorded so far corresponding to vector identification which has only been conducted by standard entomological techniques. Therefore, the present study for the first time records the molecular identification of the vector mosquito of Dirofilariasis in Sri Lanka. Entomological sampling was performed at randomly selected mosquito breeding sites in two selected Medical Officer of Health (MOH) areas; Ambanganga-korale and Matale, in Matale district. Sampling was during October to December 2022 and 156 adult female mosquitoes were collected of Armigeres, Culex, Mansonia and Anopheles genera. Mosquitoes were separated into pools based on the species, sampling location and the date of collection. Genomic DNA was extracted from 200µl of the mosquito homogenate, Polymerase Chain Reaction (PCR) amplification was performed using designed primers specific to Dirofilaria repens. The PCR products were subjected to agarose gel electrophoresis and one positive sample was identified to be compatible with the Dirofilariasis band size. Sequencing was performed to further confirm the presence of Dirofilaria in the amplified product. Anopheles was the most abundant genera (27.56%), followed by both Mansonia and Culex (25.64%) while Armigeres was the least abundant (21.15%) in the study sites. Analyzed sequence results confirm the presence of Dirofilaria repens in the mosquito samples of Armigeres subalbatus collected from Ambanganga-korale MOH. Present study confirms the presence of Dirofilaria repens in the study area of the Matale district and Armigeres subalbatus as the responsible vector for disease transmission. Moreover, study findings are effective in implementing vector controlling measures against human infection of Dirofilariasis, targeting the exact vector that transmits the disease condition.
    URI
    http://ir.kdu.ac.lk/handle/345/6816
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