Rift Valley fever in Kenya - 100 years of unanswered questions

Value of the Information & Strength of the Argument

The presentation provides valuable insights from original research, particularly the incidence study which is described as the first of its kind in Kenya. The speaker effectively argues that RVF transmission occurs even during inter-epidemic periods, challenging the traditional focus on outbreak-driven surveillance. The argumentation is logical and supported by data from his studies, though some points could benefit from more detailed statistical explanation. The discussion of species-specific incidence and the role of livestock movement adds practical value for intervention planning.

The title accurately reflects the content, which covers the history, current research, and unanswered questions about RVF in Kenya.

8/10

The speaker is a veterinarian and head of epidemiology at the Kenya Directorate of Veterinary Services, with a recent PhD on RVF. The presentation is based on his own research and references to scientific literature. However, it is a webinar talk, not a peer-reviewed publication, and some claims lack detailed citations.

Markers derived by PSI from the transcript: the creator did not define chapters.

• 02:00Introduction to RVF as a priority zoonotic disease
• 05:00History of RVF in Kenya: first description in 1912 and virus isolation in 1931
• 10:00Discussion of outbreak patterns and the shift from explosive to smaller outbreaks
• 15:00Challenging the transovarial transmission theory
• 20:00Presentation of prevalence study results in Isiolo
• 25:00Design and methods of the incidence study
• 30:00Incidence study results: seroconversion in humans and livestock during drought
• 35:00Species-specific incidence and implications for interventions
• 40:00Importance of vector control and One Health surveillance
• 45:00Conclusions and future research priorities

• Bett B, Anjanga A. (paper on RVF maintenance) — Referenced in the talk as a key paper explaining how and where the virus is maintained during inter-epidemic periods.
• WHO manual for sample size calculation — Used for calculating sample size for the incidence study.

• Bett B, et al. (2019) - 'Rift Valley fever: a review of the current status and future perspectives' — Referenced in the talk as supporting the shift in epidemiology.