From 1 January though 29 November 2017, a total of 3967 laboratory-confirmed and probable cases including 76 deaths (case fatality rate = 1.9%) were reported by the Ministry of Health to WHO. Of the cases reported, 596 were laboratory confirmed.
Figure 1: Number of confirmed and probable cases in Kenya reported by week of illness onset from 1 January through 25 November 20171
1Date of illness onset is missing for 92 cases.
From 1 January 2017 through 29 November, 20 of 47 counties (43%) in Kenya have reported cases. As of 29 November, seven counties continue to have active cholera outbreaks (Embu, Garissa, Kirinyaga, Mombasa, Nairobi, Turkana, and Wajir).
The epidemiology of cholera for Kenya in 2017 is characterized by continuous transmission in affected communities coupled with outbreaks in camp settings and institutions or during mass gathering events. Continuous transmission in the community accounts for around 70% of the total cases with the majority of cases coming from the capital county, Nairobi. Transmission in camp settings occurred mainly within Garissa and Turkana counties, accounting for around 23% of the total reported cases. Both counties host big refugee camps, namely Dadaab and Kakuma refugee camps. Refugees in these camps come from countries currently experiencing complex emergencies and large cholera outbreaks. Seven percent of cases occurred in institutions and mass gathering events, where a number of people get infected from a point source.
The country experiences cholera outbreaks every year; however, large cyclical epidemics occur approximately every five to seven years and last for two to three years.
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