Volume 92, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



We assessed the prevalence of intestinal parasites among 268 2–12-year-old children living in rural areas, small villages, and semi-urban areas of the Chaco region, south-eastern Bolivia. The overall parasitism was 69%. Only protozoa, helminths, or co-infections were observed in 89.2%, 5.9%, or 4.9% of the positive children, respectively. A significant progressive increase in overall parasite prevalence was found when passing from rural areas to small villages and semi-urban areas. The most commonly found species were (38.4%), (37.7%), and spp. (16%). was the most prevalent helminth (5.6%), followed by and hookworms (1.5% and 0.4%) evidenced only in rural areas and in villages. Molecular diagnostics identified subtypes 9 and 2, and 5 infections by and 4 by . The dramatic decrease in prevalence of soil-transmitted helminths with respect to that observed about 20 years ago (> 40%) evidences the success of the preventive chemotherapy intervention implemented in 1986. Health education and improved sanitation should be intensified to control protozoan infections.

[open-access] This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


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  • Received : 17 Jan 2014
  • Accepted : 09 Nov 2014
  • Published online : 01 Apr 2015

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