Public Health Emergencies in Kenya: Disease Outbreaks, Epidemic Response, and Pandemic Preparedness

Public health emergencies, from endemic diseases like malaria to explosive outbreaks of cholera, Rift Valley fever, and emerging threats like mpox, represent a persistent challenge for Kenya's healthcare system and the communities most vulnerable to their impact. Between 2022 and 2024, Kenya recorded over 12,666 cholera cases and 209 deaths, experienced its first-ever clade Ib mpox case in July 2024, faced malaria surges in Baringo and Turkana counties driven by unusually heavy rains, and responded to measles outbreaks in remote pastoral communities. Climate change, rapid urbanisation, population displacement, and the interactions between human and animal health through shared ecosystems compound these challenges, making robust disease surveillance, rapid response capacity, and pandemic preparedness essential components of Kenya's public health infrastructure.

Cholera: A Recurring Crisis

Cholera remains one of Kenya's most persistent public health emergencies, with outbreaks occurring with devastating regularity in informal settlements, refugee camps, and areas with inadequate water and sanitation infrastructure. The 2022-2024 cholera cycle affected more than half of Kenya's 47 counties, with a case fatality ratio of 1.7 percent that exceeded the WHO emergency threshold of one percent. The outbreak was exacerbated by the March to May 2024 long rains, which caused flooding across 43 counties and displaced over 309,330 people, creating ideal conditions for waterborne disease transmission. Vibrio cholerae thrives in contaminated water sources, and the combination of damaged water infrastructure, overcrowded temporary shelters, and inadequate sanitation facilities in flood-affected areas fuelled rapid transmission. The Ministry of Health response included deployment of oral rehydration centres, water purification and distribution, emergency vaccination campaigns with oral cholera vaccine, and community health education. The Global Task Force on Cholera Control (GTFCC) has worked with Kenya to map cholera priority areas for multisectoral interventions, recognising that sustainable cholera prevention requires long-term investment in water, sanitation, and hygiene infrastructure.

Malaria: Kenya's Biggest Killer

Malaria remains the single largest cause of morbidity and mortality from infectious disease in Kenya, accounting for approximately 13 percent of all outpatient visits and a significant proportion of paediatric hospital admissions. The Kenya Malaria Strategy 2023-2027, developed with support from the World Health Organization, outlines a comprehensive approach to malaria elimination that includes expanded distribution of insecticide-treated bed nets, indoor residual spraying, intermittent preventive treatment for pregnant women, and deployment of rapid diagnostic tests and artemisinin-based combination therapies. Climate variability has expanded malaria transmission into previously non-endemic highland areas, with outbreaks in Baringo and Turkana counties in 2024 linked to heavy rainfall that created breeding habitats for Anopheles mosquitoes. Médecins Sans Frontières (MSF) documented a triple emergency in parts of Kenya where malaria and measles outbreaks coincided with flood displacement. Kenya was among the first countries to implement the RTS,S malaria vaccine (Mosquirix) in a pilot programme, and the newer R21 vaccine approved by WHO promises even broader coverage for children in endemic areas.

Mpox: An Emerging Threat

Kenya confirmed its first mpox case in July 2024, marking the arrival of the clade Ib variant that had been circulating in the Democratic Republic of Congo and neighbouring countries. By late 2024, 36 confirmed cases had been recorded, concentrated in Nakuru, Mombasa, and Busia counties. The Ministry of Health, with support from WHO, developed a national mpox preparedness and response plan identifying 14 high-risk counties along the Northern Corridor, a major transport route running from the Kenya-Uganda border to Mombasa. Rapid response teams were deployed to intensify surveillance, conduct contact tracing, and implement infection prevention measures in healthcare facilities. Kenya's response benefited from surveillance infrastructure built during the COVID-19 pandemic, including laboratory testing capacity at the Kenya Medical Research Institute (KEMRI), which serves as the national reference laboratory for specimen confirmatory testing. The mpox response also highlighted the importance of addressing stigma associated with the disease, which can drive cases underground and undermine public health efforts.

Rift Valley Fever: A One Health Challenge

Rift Valley fever (RVF) exemplifies the interconnection between animal and human health that defines Kenya's disease landscape. The mosquito-borne viral disease primarily affects livestock, causing mass abortion and death in cattle, sheep, and goats, but can transmit to humans through contact with infected animal tissues or mosquito bites. Kenya has experienced major RVF outbreaks coinciding with periods of heavy rainfall associated with El Niño events, with affected counties including Wajir, Marsabit, Garissa, and other arid and semi-arid regions where pastoralist communities depend on livestock for their livelihoods. The economic impact extends beyond human illness to devastating livestock losses that destroy the assets and food security of pastoral communities. Active surveillance has been strengthened in affected and at-risk counties, with contact tracing and vector control operations deployed rapidly. FHI 360 has worked closely with the CDC Kenya office to support the Ministry of Health and county-level authorities in strengthening surveillance systems. Kenya's One Health Strategic Plan for disease prevention recognises that effective RVF response requires coordinated action across human health, veterinary, and environmental sectors.

Disease Surveillance and Early Warning Systems

Kenya's disease surveillance infrastructure has been significantly strengthened through sustained investment by the government and international partners. The Integrated Disease Surveillance and Response (IDSR) system provides the framework for detecting, reporting, and responding to disease events at national and county levels. The US Centers for Disease Control and Prevention (CDC) has collaborated with KEMRI since 1979, supporting population-based surveillance, facility-based surveillance, rapid mortality surveillance, and event-based surveillance systems. The Field Epidemiology and Laboratory Training Programme (FELTP) trains frontline public health workers who serve as first responders to emergencies including COVID-19, mpox, yellow fever, and Ebola alerts. Laboratory capacity has expanded significantly, with KEMRI and county-level laboratories able to conduct diagnostic testing for a growing range of pathogens. Digital health tools including mobile-based disease reporting, geographic information systems for outbreak mapping, and electronic early warning platforms enable faster detection and response.

Climate Change and Health Emergencies

Climate change is reshaping Kenya's disease burden in ways that amplify existing vulnerabilities. Rising temperatures expand the geographic range of vector-borne diseases including malaria, dengue fever, and Rift Valley fever into highland areas that were previously too cool for disease transmission. More frequent and intense flooding events overwhelm water and sanitation infrastructure, triggering waterborne disease outbreaks. Prolonged droughts concentrate populations around diminishing water sources, increasing disease transmission risk and malnutrition that weakens immune defences. The 2024 floods, which affected 43 counties and displaced hundreds of thousands, demonstrated how climate extremes can trigger cascading public health emergencies as displaced populations face simultaneous risks of cholera, malaria, respiratory infections, and malnutrition.

Pandemic Preparedness and the Future

The COVID-19 pandemic exposed both strengths and weaknesses in Kenya's public health emergency response capacity. The rapid establishment of testing infrastructure, the deployment of community health workers for contact tracing, and the eventual vaccine rollout demonstrated institutional capacity, while supply chain disruptions, misinformation, and the economic impact of containment measures revealed vulnerabilities. Post-pandemic reforms have focused on strengthening health system resilience, expanding laboratory networks, building domestic vaccine manufacturing capacity, and establishing emergency operations centres at county levels. Kenya's participation in global health security frameworks including the International Health Regulations and the Africa CDC's continental health security strategy positions the country within international networks for disease intelligence sharing and coordinated response. As emerging infectious diseases continue to cross borders with increasing frequency, Kenya's investment in surveillance, workforce training, laboratory capacity, and community engagement will determine its ability to protect its population from the next public health emergency.