The effect of ivermectin on geohelminth frequency (i.e. as used in the onchocerciasis control program in Colombia)

Evaluating the effect of ivermectin on soil-transmitted helminthes (STH) infection frequency in a Colombian population included in the Onchocerciasis Elimination Program for the Americas (OEPA). This was an impact evaluation study which adopted a longitudinal approach using the population of Naicion...

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Bibliographic Details
Published in:Revista de salud pública (Bogotá, Colombia) Colombia), 2012-08, Vol.14 (4), p.681-694
Main Authors: Knudson, Angélica, Ariza, Yoseth, López, Myriam C, Fajardo, Oscar S, Reyes, Patricia, Moncada, Ligia I, Duque, Sofía, Álvarez, Carlos A, Nicholls, Rubén S
Format: Article
Language:Spanish
Subjects:
Adolescent
Adult
Aged
Antiparasitic Agents - therapeutic use
Child
Child, Preschool
Colombia
Female
Humans
Infant
Ivermectin - therapeutic use
Longitudinal Studies
Male
Middle Aged
National Health Programs
Onchocerciasis - epidemiology
Onchocerciasis - prevention & control
Program Evaluation
Young Adult
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Summary:Evaluating the effect of ivermectin on soil-transmitted helminthes (STH) infection frequency in a Colombian population included in the Onchocerciasis Elimination Program for the Americas (OEPA). This was an impact evaluation study which adopted a longitudinal approach using the population of Naicioná (1996) as baseline for comparison to people from the same population as controls (2008). The cross-sectional approach involved comparing the reference population of Naicioná (2008) to the population of Dos Quebradas (2008) used as controls. Fecal samples were processed by a modified Ritchie-Frick method. Ascaris lumbricoides was the most frequently found parasite in Naicioná (60/121; 49.6 %: 37.8-63.895%CI) and in Dos Quebradas (36/76; 47.4 %: 33.2-65.6 95 % CI). Ivermectin's main effect on the population aged over 5 years was a decreased risk of Trichiuris trichiura infection in both longitudinal assessment (86 % reduction: 74-93 95 % CI) and cross-sectional assessment (63 %:24-82 95 % CI). A 93 % reduction (45-99 95 % CI) in Strongyloides stercoralis frequency was found in longitudinal assessment, compared to 85 % in cross-sectional assessment (-031-99 95 % CI). Ivermectin use in the OEPA is not sufficient for STH morbidity control. Integrated programs including education and basic sanitation are required.
ISSN:0124-0064