Transmission dynamics of diurnally subperiodic lymphatic filariasis transmitted by Ochlerotatus (Finlaya) niveus in the Andaman & Nicobar Islands.

摘要: Background & objectives: In India diurnally subperiodic filariasis is prevalent only in the Nicobar district of Andaman and Islands, with significant health problem. Sample surveys indicated that this form restricted to a small region Nancowry group islands Ochlerotatus niveus as vector. We therefore carried out comprehensive study assess transmission dynamics LF Teressa island view its control evaluation interventions. Methods: Entomological studies were for period twelve months covering all seasons year, by means man landing catches Island, an endemic filariasis. Parameters viz., annual biting rate (ABR), infective (AIBR), index (ATI), risk infection (RII) potential (ATP), which reflect intensity filariasis, estimated. Host efficiency Oc. was also assessed. Results: The number vectors person year estimated be 21851, 107 harbouring parasite. Risk 0.02332. Every area at receiving 22 stage larvae per year. host over 40 cent microfilariae ingested able develop into stages. ATP 169 evidence round transmission. pattern monthly suggested high during summer months. Interpretation conclusions: Perennial Wuchereria bancrofti typical forest ecosystem evident Island parameters suggesting season Personal protection measure method choice protect from infection, because day biting, exophilic exophagic behaviour vector are not amenable larvicidal measures. An alternative would use selective or periodic mass chemotherapy reduce parasite load community.