Volume 31, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


. The prevalence and distribution of mansonellosis was studied among the inhabitants of the 16 villages and towns on or near the Colombian bank of the Amazon (Comisaría del Amazonas) and in one neighboring Peruvian village. The average prevalence rate among the blood samples (Knott) of 535 residents was 47.1%; the rate in individual villages ranged from 15.6–84.6%. The infection was more common in men (55%) than in women (42%) and increased with age in both sexes. Approximately 80% of the infected persons had fewer than 200 microfilariae/ml of peripheral blood; in approximately 10% the number exceeded 1,000/ml. The Huitot Indians residing in one (Kilometro 11) of the two settlements populated by immigrants were free of infection; 60% of the Yagua Indians of Peruvian origin who settled in the other (La Maloca) were infected. The high prevalence rates in certain villages and the high number of circulating microfilariae in some of their inhabitants suggested active local transmission. The prevalence of mansonellosis in this area of the Colombian Amazon is similar to that detected in neighboring areas of Brazil, indicating that this region is a part of a larger focus which extends along the Amazon from Brazil into Perú and includes a portion of Colombia. Although the prevalence rate of mansonellosis in this part of the Comisaría del Amazonas is the second highest detected to date in Colombia, these findings should not be extrapolated to indicate that similar prevalence occurs throughout the Comisaría. Additional surveys are needed to determine the distribution and prevalence of mansonellosis in the regions of the Comisaría not included in this study.


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