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  • Title: Strongyloides stercoralis infection and re-infection in a cohort of children in Cambodia.
    Author: Khieu V, Hattendorf J, Schär F, Marti H, Char MC, Muth S, Odermatt P.
    Journal: Parasitol Int; 2014 Oct; 63(5):708-12. PubMed ID: 24970767.
    Abstract:
    Information on Strongyloides stercoralis re-infection after ivermectin treatment is scarce in S. stercoralis endemic countries. In semi-rural Cambodia, we determined S. stercoralis infection and re-infection rates among schoolchildren, two years after ivermectin treatment (2×100 μg/kg PO, 24 h apart). The study was conducted among 484 children from four primary schools in semi-rural villages in Kandal province from 2009 to 2011, using Koga agar plate culture and the Baermann method on two stool samples per child. Complete data were available for 302 participants. We observed infections in 24.2% and 22.5% of the children at baseline and at follow-up, respectively. At baseline, 73 children were treated for S. stercoralis infection. At follow-up, one-third of those treated for S. stercoralis infection had been reinfected, while 19.6% of the 229 healthy children (at baseline) had been newly infected with S. stercoralis. Possession of shoes and defecation in toilet were negatively associated with S. stercoralis infection at follow-up. Infection and re-infection rates of S. stercoralis among schoolchildren are considerably high. However, 68.5% of infected children remained free of infection for at least two years. A large-scale cohort study is required to understand age-specific infection and re-infection dynamics in endemic countries.
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