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University of Nairobi (2021)

The Occurrence of Cystic Echinococcosis and Molecular Characterization From Livestock in Isiolo, Garissa and Wajir Counties, Kenya

Omondi, Hellen A

Titre : The Occurrence of Cystic Echinococcosis and Molecular Characterization From Livestock in Isiolo, Garissa and Wajir Counties, Kenya

Auteur : Omondi, Hellen A

Université de soutenance : University of Nairobi

Grade : Master of Science in Veterinary Public Health 2021

Résumé partiel
Cystic Echinococcosis (CE) is a zoonotic disease, spread worldwide and caused by the larvae of wild and domestic canids tapeworm, Echinococcus granulosus. Its prevalence in livestock has been reported in the wider African continent and in Kenya notably in the endemic regions of Maasailand and Turkana. Recent studies demonstrate its occurrence in non-endemic regions including Laikipia, Migori and Isiolo counties. CE‘s prevalence is high among rural pastoralist communities where socioeconomic and cultural conditions facilitate its transmission. Isiolo, Garissa and Wajir counties are regions with large numbers of pastoralist communities whose livelihood depends on livestock keeping. The current study aimed to estimate the prevalence of CE in livestock in the north-eastern counties of Kenya including Isiolo, Garissa and Wajir and characterize the species of E. granulosus sensu lato present. Slaughter house surveys was used. Data collected included the total number of animals slaughtered, species, number infected and location of the cyst. The data was analyzed using Stata 15 with risk factors associated with the disease occurrence analyzed at both univariable and multivariable levels using chi-square and logistic regression. The overall prevalence rates for CE included 29.1% in camels (68/234), 14.4% in bovines (17/118), 9.9% (68/689) in caprine and 8.2% in ovine (27/329). A total of 295 cysts were recovered from the 180 infected animals including 153(51.86%) from camels, 80(27.12%) from caprine, 35(11.36%) from ovine and 27(9.15%) from bovines. Isiolo County had the highest number of recovered cysts at 61.4% (181/295), Garissa County at 20.3% (60/295) and Wajir County at 18.3% (54/295). The liver was the most frequently infected organ with 72.88%(215/295) and 26.44%(78/295) from the lungs, the heart and masseter muscle each had one cyst. Cysts termed fertile were only recovered from the lungs of camels in Isiolo county.

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