Interruption of the transmission of Onchocerca volvulus in the Kashoya-Kitomi focus, western Uganda by long-term ivermectin treatment and elimination of the vector Simulium neavei by larviciding
Abstract Uganda is the only country in sub-Saharan Africa whose onchocerciasis elimination programme extensively uses vector control and biannual treatment with ivermectin. The purpose of this study was to assess the impact of combined strategies on interrupting onchocerciasis transmission in the Kashoya-Kitomi focus. Mass Drug Administration annually (13 years) followed by biannual treatments (6 years) and ground larviciding (36 cycles in 3 years) with temephos (Abate ? , EC500) against Simulium neavei were conducted. Routine fly catches were conducted for over seven years in six catching sites and freshwater crabs Potamonautes aloysiisabaudiae were examined for immature stages of Simulium neavei . Epidemiological assessments by skin snip were performed in 2004 and 2013. Collection of dry blood spots (DBS) from children Treatment coverage with ivermectin improved with introduction of biannual treatment strategy. Microfilaria prevalence reduced from 85% in 1991 to 62% in 2004; and to only 0.5% in 2013. Crab infestation reduced from 59% in 2007 to 0% in 2013 following ground larviciding. Comparison of total fly catches before and after ground larviciding revealed a drop from 5334 flies in 2007 to 0 flies in 2009. Serological assays conducted among 1,362 children in 2010 revealed 11 positive cases (0.8%; 95% CI: 0.4%–1.2%). However, assessment conducted on 3246 children in 2013 revealed five positives, giving point prevalence of 0.15%; 95% CI: 0.02%-0.28%. Four of the five children subjected to O-150 PCR proved negative. The data show that transmission of onchocerciasis has been interrupted based on national and WHO Guidelines of 2012 and 2016, respectively. Highlights We describe the effect of combining annual and bi-annual ivermectin treatment with ground larviciding using temephos (Abate ? EC500) against S. neavei in the interruption of onchocerciasis transmission. Epidemiological, entomological and serological assessments were performed. Significant reductions in mf prevalence, crab infestations and S. neavei adult catches were observed in the focus. Four IgG4 positive children subjected to O-150 PCR skin snip analysis were all negative. The data suggest that interruption of transmission of onchocerciasis has been achieved in the focus. Graphical abstract [DISPLAY OMISSION]
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- DOI : http://dx.doi.org/10.1016/j.actatropica.2016.12.029
- Elsevier : 저널> 권호 > 논문
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