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Five years of post-validation surveillance of lymphatic filariasis in Thailand

Infectious Diseases of Poverty 2023年第6期12卷 61-78页

作者： Prapapan Meetham Rawadee Kumlert Deyer Gopinath Siriporn Yongchaitrakul Tanaporn Tootong Sunsanee Rojanapanus Chantana Padungtod Division of Vector Borne Diseases Department of Disease ControlMinistry of Public HealthNonthaburiThailand World Health Organization(WHO) Country OfceNonthaburiThailand Department of Disease Control Ministry of Public HealthNonthaburiThailand

Background The World Health Organization (WHO) validated Thailand in 2017 as having eliminated lymphatic filariasis (LF) as a public health problem with recommendations for continued surveillance. This article describes measures and progress made in Thailand with post-validation surveillance (PVS) of LF from 2018 until *** The implementation unit (IU) is a sub-village in 11 former LF endemic provinces. Human blood surveys are targeted in 10% of IUs each year. InWuchereria bancrofti areas, filaria antigen test strips (FTS) are used, and inBrugia malayi areas, antibody test kits (Filaria DIAG RAPID) are used. Positive cases are confirmed by thick blood film (TBF) and polymerase chain reaction (PCR). Vector surveys for mosquito species identification and dissection for microfilaria (Mf)/filarial larvae are done in 1% of IUs where human blood surveys are conducted. Human blood surveys using FTS are conducted among migrants in five provinces. Surveillance of cats is done in areas that previously recorded > 1.0% Mf rate among cats. Morbidity management and disability prevention (MMDP) are done every 2 years in LF-endemic areas where chronic disease patients *** From 2018 to 2022, in a total of 357 IUs in 11 provinces, human blood surveys were conducted in 145 IUs (41%) with an average population coverage of 81%. A total of 22,468 FTS and 27,741 FilariaDIAG RAPID were performed. 27 cases were detected: 3 cases ofW. bancrofti in Kanchanaburi province and 24 cases ofB. malayi in Narathiwat province. 4 cases ofW. bancrofti were detected in two provinces through routine public health surveillance. Vector surveys in 47 IUs detectedB. malayi Mf filarial larvae only in Narathiwat province. Chronic LF patients reduced from 114 in 2017 to 76 in 2022. Surveys among 7633 unregistered migrants yielded 12 cases ofW. bancrofti. Mf rate among cats in Narathiwat province declined from 1.9% in 2018 to 0.7% in 2022. MMDP assessments revealed gaps in healthcare provider’s

关键词： Lymphatic filariasis Elimination post validation Surveillance Neglected tropical diseases Thailand

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