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(Last updated: January 25, 2019)
Simon M. Njoroge
Senior Lecturer
Head of Department of Environmental Health, School of Public Health
Recent Publications
Musotsi, P.Y., Otieno, C.A. & Njoroge, S.M., 2017. Prevalence of Fasciolosis in Cattle, Sheep, and Goats Slaughtered in Slaughter Slabs in Trans-Nzoia West, Kenya. and Knowledge of Livestock Handlers. Journal of Biology, Agriculture and Healthcare, 7(6), p.34-43. Abstract
Background: Fasciolosis is known globally to be an important helminthic disease of ruminants caused by liver
fluke species of the genus Fasciola, and it is one of the most neglected tropical zoonotic diseases that can lead to
human infection. It has the widest geographic spread of any emerging zoonotic disease, and it occurs in many
countries of the world. Objectives: The study aimed at determining the prevalence of fasciolosis in ruminants
slaughtered in Trans-Nzoia West. Specific objectives were to establish the trend of fasciolosis in ruminants,
ascertain the relationship between fasciolosis prevalence and rainfall patterns and assess the knowledge of meat
sellers and farmers about fasciolosis. Methodology: A 5-year secondary data retrospective study was carried out
in Trans-Nzoia West, Trans-Nzoia County. The study population consisted of ruminants slaughtered, meat
sellers and livestock farmers.Results: A total of 104,221 cattle, sheep and goats were slaughtered in the five-year
period in which 6,098 (5.85%) were infested with fasciolosis with a prevalence of 6.52%, 6.08% and 4.1 0% in
cattle, sheep, and goats respectively. Most meat sellers (72.2%) were able to identify fasciolosis in infested livers,
88.9% reported liver flukes infestation resulted in the loss of income while 58.3% were not aware of nutrition
depletion associated with fasciolosis. Of the farmers interviewed, 52.9% grazed in swampy areas, 66.7%
dewormed after 3 months, 78.4% had heard about fasciolosis and 80.0% did not know the cause of fasciolosis.
The majority (95.0%) were not aware of the snail species spreading liver flukes while 77.5% did not know that
fasciolosis was a zoonotic disease.Conclusion: Fasciolosis was prevalent in the area and caused great economic
loss to the meat sellers. Most farmers were not aware of its cause and zoonotic nature. Recommendations:
Fasciolosis control should be approached from a multidisciplinary angle and farmers should be educated on it
and its zoonotic nature.
Njoroge, S.M., Munyao, T.M. & Osano, O., 2016. Modeling relationship between organic carbon partition coefficient and pesticides solubility of pesticides used along the shore of lake Naivasha, Kenya. American Journal of Environmental Engineering, 6(2), p.33–37. Abstract
Pesticides have many different properties that affect their behaviour in the environment. Pesticide’s solubility
in water has a great impact on leaching potential and environmental fate. The objective of this study was to determine the
relationship between organic carbon based partition coefficient (koc) and pesticides solubility (S) of pesticides used along the
shore of Lake Naivasha using regression analysis. The properties (S, and soil/water equilibrium partition coefficient (kd)) of
pesticides selected from an inventory of pesticides used in farms around Lake Naivasha, were determined from the
manufacturers’ materials safety data sheets. The organic carbon (foc) of the soil from the study area was then determined using
the loss-on-ignition (LOI) method and used to calculate koc. The results showed that the soils around Lake Naivasha had a
mean organic carbon (foc) content of 1.770% and a regression equation for koc and S for the area to be log koc = -0.368logS +
3.256. It was concluded that this relationship can be used to estimate the organic carbon based partition coefficient (koc) of a
pesticide where S is available, and the results compared with values determined experimentally and from other models.
Mamboleo, D.M., et al., 2016. The Prevalence of Diarrheal Diseases in Childcare Institutions, Uasin Gishu County, Kenya. International Journal of Research in Environmental Science (IJRES), 2(6), p.5-11. Website Abstract
Diarrheal disease is one of the leading middle income countries. This study examined diarrheal
diseases among children in Uasin Gishu County’s childcare institutions per age, sex, duration of a child in a
childcare institution, and use of soap in hand washing after visiting the toilet. The study involved 202 children
between ages 6 to 20 years old. There were65.8% boy child and 34.2 girls, 71.3% of these children were
between 6-15 years old. The study found 64.4% children used soap to wash hands after toilet. Use of soap in
hand washing increased with increase in children’s age, with a girl using soap more in hand washing at the rate
of84.1% compared to a boy child. The study learned that 90.1% children had suffered from diarrheal diseases
within 28 days where61.4% boys had suffered from diarrhea. Chi-square analysis showed a significant
relationship between diarrheal diseases and children’s age (P<0.001) while there was a significant relationship
between diarrhea andgender (P<0.001). It was concluded that the prevalence of diarrheal diseases in Uasin
Gishu County child care institutions was 90.1% and that boys were affected more than the girls. Health
education on use of soap in hand-washing after toilet should be intensified as a means of decreasing diarrheal
diseases.
Njoroge, S.M., Osano, O. & Mutuku, M.T., 2015. IPM AMELIORATES RISKS OF GROUNDWATER PESTICIDE CONTAMINATION IN LAKE NAIVASHA BASIN, KENYA. International Journal of Science Technology and Management, 4(1), p.253-258. IPM AMELIORATES RISKS OF GROUNDWATER PESTICIDE CONTAMINATION IN LAKE NAIVASHA BASIN, KENYA Abstract
Increasing use of pesticides threatens the quality of groundwater with contamination. The objective of the study
was to assess the use of integrated pest management (IPM) in reducing the risks of groundwater contamination
in Lake Naivasha basin, Kenya. Interviewer administered questionnaires were used to collect data on types and
quantities of pesticides used; and other methods used to control weeds, pests and plant diseases. The results
showed that 141 pesticides were used in the basin and that 75% of farms were applying pesticides in high
quantities. All the farms were also using IPM where pesticides and other conservative means were applied.
Majority of farms (62.5%) reported average harvest when IPM methods were used. It was concluded that IPM
program around Lake Naivasha is still in its initial stages and in transition from intensive pesticide use. The
risk of groundwater contamination in the lake basin is therefore still high.
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