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Risk of Recrudescence of Lymphatic Filariasis after Post-MDA Surveillance in Brugia malayi Endemic Belitung District, Indonesia

Authors
  • Santoso,
  • Yahya,
  • Supranelfy, Yanelza
  • Suryaningtyas, Nungki Hapsari
  • Taviv, Yulian
  • Yenni, Aprioza
  • Arisanti, Maya
  • Mayasari, Rika
  • Mahdalena, Vivin
  • Nurmaliani, Rizki
  • Marini,
  • Krishnamoorthy, K.
  • Pangaribuan, Helena Ullyartha
Type
Published Article
Journal
The Korean Journal of Parasitology
Publisher
The Korean Society for Parasitology and Tropical Medicine
Publication Date
Dec 31, 2020
Volume
58
Issue
6
Pages
627–634
Identifiers
DOI: 10.3347/kjp.2020.58.6.627
PMID: 33412766
PMCID: PMC7806434
Source
PubMed Central
Keywords
License
Unknown

Abstract

Belitung district in Bangka-Belitung Province, Indonesia with a population of 0.27 million is endemic for Brugia malayi and 5 rounds of mass drug administration (MDA) were completed by 2010. Based on the results of 3 transmission assessment surveys (TAS), the district is declared as achieving elimination of lymphatic filariasis (LF) in 2017. The findings of an independent survey conducted by the National Institute of Health Research and Development (NIHRD) in the same year showed microfilaria (Mf) prevalence of 1.3% in this district. In 2019, NIHRD conducted microfilaria survey in 2 villages in Belitung district. Screening of 311 and 360 individuals in Lasar and Suak Gual villages showed Mf prevalence of 5.1% and 2.2% with mean Mf density of 120 and 354 mf/ml in the respective villages. Mf prevalence was significantly higher among farmers and fishermen compared to others and the gender specific difference was not significant. The results of a questionnaire based interview showed that 62.4% of the respondents reported to have participated in MDA in Lasar while it was 57.7% in Suak Gual village. About 42% of the Mf positive cases did not participate in MDA. Environmental surveys identified many swampy areas supporting the breeding of Mansonia vector species. Persistence of infection is evident and in the event of successful TAS3 it is necessary to monitor the situation and plan for focal MDA. Appropriate surveillance strategies including xenomonitoring in post-MDA situations need to be developed to prevent resurgence of infection. Possible role of animal reservoirs is discussed.

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