STUDIES ON MAN-BITING SIMULIUM AND THE PREVALENCE OF ONCHOCERCIASIS AT DALLE VILLAGE, NEAR KAFANCHAN, KADUNA STATE, NIGERIA.
STUDIES ON MAN-BITING SIMULIUM AND THE PREVALENCE OF ONCHOCERCIASIS AT DALLE VILLAGE, NEAR KAFANCHAN, KADUNA STATE, NIGERIA.
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Date
1985-08
Authors
ISHAYA, HARUNA NOCK
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Abstract
A survey of breeding sites was carried out in theriver systems of the Upper and Lower Jos Plateau, covering 3 states, namely, Bauchi, Kaduna and Plateau. Five active breeding sites of Sirnuliun damnosum s.l. were found, one
of these, site 8, near Dalle village by River Kogun is new, therefore, this study was focused on the Dalle area. Some studies on man-biting Simulium were carried out by examining the fly biting density, infective biting density and transmission potential in relation to the prevalence of the disease in the human population at Dalle
village. The Dalle study covered a six month period:June - August and October. December, 1984,which represent the wet and dry seasons respectively.The fly biting density, infective bitingdensity and transmission potential! are shown to vary with the day, month and season. In the wet season,these were 4,193; 153 and 281 respectively. For the dry season, these dropped to 1,532: 71 and 38 respectively, The highest and lowest fly biting densities were found in June and December respectively.
Of 223 people examined, 21 (9.4°/c) were found positive for onchocerciasis; 10 and 11 of these were males and females respectively.
iv. The disease prevalence showed an increase with age, pre-school children (less than 6 years) did not show any infection; the highest prevalence was observed in the age group of 56 years and above. The prevalence was higher in men than women. The intensity of infection was low (4,8 microfilariae/snip), but showed an increase with age, reaching a peak in the 36-45 year age group.Generally, there were no severe clinical features of the disease (like blindness) among the inhabitants of Dalle village.
It is suggested that the high transmission of the disease is associated with the microfilarial load in the human population of Dalle and the neighbouring villages;
while the fall in fly biting density especially in July, is attributed to the hours of the day in which no adult flies catches were made because of rain and to the effect of flood on larval settling sites. The adverse dry season conditions affected the survival rate of the flies
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY, IN PARTIAL FULFILMENT
OF THE REQUIREMENTS FOR THE DEGREE OF MASTER
OF SCIENCE (M.Sc.) IN ZOOLOGY.AUGUST,
Keywords
STUDIES, MAN-BITING SIMULIUM, PREVALENCE, ONCHOCERCIASIS, DALLE VILLAGE, NEAR KAFANCHAN, KADUNA STATE, NIGERIA