Kenya is experiencing a notable increase in dengue fever cases, particularly in the northeastern counties of Garissa and Wajir. According to surveillance data from the Ministry of Health cited by the World Health Organization (WHO), a total of 1,679 cases have been confirmed since April 2026.

Garissa leads with 1,583 recorded infections and five suspected deaths, while Wajir has reported 96 cases distributed across five sub-counties, with Wajir East accounting for approximately 91% of these cases.

Demographic and Transmission Details

The majority of infections occur among adults aged 25 to 44 years, indicating a broad age range affected by the outbreak. While transmission rates in Garissa showed signs of decline by July, Wajir continues to report active cases, raising concerns about further spread in the region.

Background and Symptoms

Dengue fever is a viral illness spread primarily by Aedes mosquitoes, especially Aedes aegypti, which are active during daylight hours. Symptoms include high fever, severe headaches, pain behind the eyes, muscle and joint pains, nausea, vomiting, and skin rashes. Severe cases may develop complications such as bleeding, shock, organ failure, and can be fatal.

Regional and Environmental Factors

Historically, dengue outbreaks in Kenya have been concentrated along the coastal counties like Mombasa, Kilifi, and Kwale. The current surge in Garissa and Wajir highlights the expanding reach of the disease into arid and semi-arid areas. Environmental factors such as changes in rainfall patterns, flooding, temperature shifts, and water storage practices are believed to contribute to increased mosquito breeding and disease transmission.

Public Health Response

  • Health authorities continue to monitor dengue alongside other infectious diseases.
  • Recent testing of 196 suspected Ebola samples returned negative results, easing fears of a concurrent hemorrhagic fever outbreak.
  • Efforts to distinguish dengue from malaria are critical, as symptoms can overlap and lead to misdiagnosis, especially in malaria-endemic regions.

The Ministry of Health emphasizes the importance of vector control, public awareness, and improved diagnostic capabilities to manage the outbreak and prevent further spread.