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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 101, No. 2, 2006, pp. 201-205
Bioline Code: oc06035
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 101, No. 2, 2006, pp. 201-205

 en Longitudinal evaluation of repellent activity of Ocimum gratissimum check for this species in other resources (Labiatae) volatile oil against Simulium damnosum check for this species in other resources
LPE Usip; KN Opara; ES Ibanga & IA Atting

Abstract

To determine the repellent activity of Ocimum gratissimum check for this species in other resources volatile oil against Simulium damnosum check for this species in other resources (blackflies), a 12 month (January-December 2003) field study was conducted in three onchocerciasis endemic communities (Idomido, Obio camp, and Ikot Adaha) in Ini Local Government Area of Akwa Ibom State, Nigeria. The result revealed that topical application of 20% (v/v) concentration of the oil with liquid paraffin as a base, reduced the biting rate of S. damnosum by 90.2, 81.6, and 79.7%, in Idomido, Obiocamp, and Ikot Adaha respectively. The oil gave protection against the bite of S. damnosum for at least 3 h. A total of 710 adults S. damnosum were caught by individuals treated with Ocimum oil, as against 4296 caught by the control group. When the flies caught by the treated individuals were dissected none of them was infected with microfilariae of Onchocerca volvulus check for this species in other resources . Human-vector contact and onchocerciasis transmission could be reduced by the topical application of the volatile oil during the peak biting periods of the vector.

Keywords
Ocimum gratissimum - blackfly Simulium damnosum - repellent activity

 
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