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Oyas, H.

Publications and source records attributed to Oyas, H..

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High Real-time Reporting of Domestic and Wild Animal Diseases Following Rollout of Mobile Phone Reporting System in Kenya

BackgroundTo improve early detection of emerging infectious diseases in sub-Saharan Africa (SSA), many of them zoonotic, numerous electronic animal disease-reporting systems have been piloted but not implemented because of cost, lack of user friendliness, and data insecurity. In Kenya, we developed and rolled out an open-source mobile phone-based domestic and wild animal disease reporting system and collected data over two years to demonstrate its robustness and ability to track disease trends. MethodsThe Kenya Animal Biosurveillance System (KABS) application was built on the Java(R) platform, freely downloadable for android compatible mobile phones, and supported by web-based account management, form editing and data monitoring. The application was integrated into the surveillance systems of Kenyas domestic and wild animal sectors by adopting their existing data collection tools, and targeting disease syndromes prioritized by national, regional and international animal and human health agencies. Smartphone-owning government and private domestic and wild animal health officers were recruited and trained on the application, and reports received and analyzed by Kenya Directorate of Veterinary Services. The KABS application performed automatic basic analyses (frequencies, spatial distribution), which were immediately relayed to reporting officers as feedback. ResultsOver 95% of trained domestic animal officers downloaded the application, and >72% of them started reporting using the application within three months. Introduction of the application resulted in 2- to 10-fold increase in number of disease reports when compared the previous year (p<0.05), and reports were more spatially distributed. Among domestic animals, food animals (cattle, sheep, goats, camels, and chicken) accounted for >90% of the reports, with respiratory, gastrointestinal and skin diseases constituting >85% of the reports. Herbivore wildlife (zebra, buffalo, elephant, giraffe, antelopes) accounted for >60% of the wildlife disease reports, followed by carnivores (lions, cheetah, hyenas, jackals, and wild dogs). Deaths, traumatic injuries, and skin diseases were most reported in wildlife. ConclusionsThis open-source system was user friendly and secure, ideal for rolling out in other countries in SSA to improve disease reporting and enhance preparedness for epidemics of zoonotic diseases. Authors SummaryTaking advantage of a recently developed freely downloadable disease reporting application in the United States, we customized it for android smartphones to collect and submit domestic and wild animal disease data in real-time in Kenya. To enhance user friendliness, the Kenya Animal Biosurveillance System (KABS) was installed with disease reporting tools currently used by the animal sector and tailored to collected data on transboundary animal disease important for detecting zoonotic endemic and emerging diseases. The KABS database was housed by the government of Kenya, providing important assurance on its security. The application had a feedback module that performed basics analysis to provide feedback to the end-user in real-time. Rolling out of KABS resulted in >70% of domestic and wildlife disease surveillance officers using it to report, resulting in exponential increase in frequency and spatial distributions of reports regions. Utility of the system was demonstrated by successful detected a Rift Valley fever outbreak in livestock in 2018, resulting in early response and prevention of widespread human infections. For the wildlife sector in Eastern Africa, the application provided the first disease surveillance system developed. This open-source system is ideal for rolling out in other countries in sub-Saharan Africa to improve disease reporting and enhance preparedness for epidemics of zoonotic diseases.

microbiology

Incidence of Brucella spp. in various livestock species raised under the pastoral production system in Isiolo County, Kenya.

BackgroundBrucellosis is an important zoonosis with a worldwide distribution. The disease is caused by multiple species of Brucella that can infect a wide range of mammalian hosts. In the sub-Saharan Africa, many studies have been implemented to determine the prevalence of the disease in livestock, but not much is known about its incidence. We implemented a longitudinal study to determine the incidence of Brucella spp. infection in cattle, camels, sheep and goats that were being raised in a pastoral area in Isiolo County, northern Kenya. MethodsAn initial cross-sectional survey was implemented to identify unexposed animals for follow up; that survey used 141 camels, 216 cattle, 208 sheep and 161 goats. A subsequent longitudinal study recruited 31 cattle, 22 sheep, 32 goats and 30 camels for follow up. All the samples collected were screened for Brucella spp. using the Rose Bengal Plate test (RBPT), a modified RBPT, and an indirect multispecies Enzyme Linked Immunosorbent Assay (iELISA) kit. Samples that tested positive by any of these serological tests were further tested using real-time PCR-based assays to detect genus Brucella DNA and identify Brucella species. These analyses targeted the alkB and BMEI1162 genes for B. abortus, and B. melitensis, respectively. The longitudinal study took 12 months and data were analysed using Cox proportional hazards model that accounted for clustering of observations within herds. Changes in anti-Brucella IgG optical values between successive sampling periods were determined to confirm primary exposures. ResultsThe mean incidence rate of Brucella spp. was 0.024 (95% confidence interval [CI]: 0.014 - 0.037) cases per animal-months at risk. Brucella spp. incidence in camels, cattle, goats and sheep were 0.053 (0.022 - 0.104), 0.028 (0.010 - 0.061), 0.013 (0.003 - 0.036) and 0.006 (0.0002 - 0.034) cases per animal-month at risk, respectively. A higher incidence rate of Brucella spp. was found among females (0.020, 0.009 - 0.036) than males (0.016, 0.004 - 0.091), while young animals (0.026, 95% CI; 0.003 - 0.097) had a slightly higher incidence rate compared to adults (0.019, 95% CI; 0.009 - 0.034). RT PCR analyses showed that B. abortus was more prevalent than B. melitensis in the area. The results of multivariable Cox regression analysis identified species (camels and cattle) as an important predictor of Brucella spp. exposure in animals. On the diagnostic tests, modified RBPT provided similar findings as the iELISA test. ConclusionsOur findings indicated that camels and cattle have a higher incidence of Brucella spp. exposure than the other livestock species. This could be due to the higher prevalence of B. abortus, which readily infects these species, than B. melitensis. More studies are underway to identify ecological factors that influence the persistence of the key Brucella species in the area. The study further concluded that modified RBPT test can give reliable results as those of a formal iELISA test, and it can therefore be used for routine surveillance in the region. Author summaryBrucellosis is a neglected disease that is endemic in many pastoral areas. This study describes the incidence patterns of Brucella spp. in various livestock species (cattle, camels, sheep and goats) in Kinna in Isiolo County, northern Kenya. We also evaluated the diagnostic sensitivity of three serological tests; RBPT, a modified RBPT and an iELISA test in the diagnosis of brucellosis in animals that were suspected to be naturally exposed. Results from this study showed that both cattle and camels had a significantly higher incidence of Brucella spp. compared to sheep and goats. The number of animals found to be seropositive for Brucella spp. by the modified RBPT and iELISA did not differ significantly. Both tests also detected a significantly higher number of seropositive animals than RBPT. This finding confirms that the modified RBPT provides comparable results as iELISA, which is known to have higher sensitivity and specificity, and therefore the former can be used for more surveillance activities in pastoral areas.

microbiology