Following a possible influenza A outbreak, Kenyatta National Hospital is providing free flu shots.
KNH said it is presently only delivering it to health workers, under a project backed by Washington State University, which conducts infectious disease research in Kenya.
Surveillance between September and November this year revealed an outbreak of Influenza A, according to the Kenya Medical Research Institute in Kisumu.
A, B, C, and D are the four kinds of influenza viruses.
During practically every rainy season in Kenya, human influenza A and B viruses generate seasonal epidemics of sickness known as flu season.
While the flu usually goes away on its own without causing any noticeable symptoms, severe cases of type A influenza can be fatal.
A doctor may prescribe an antiviral medicine to help fight the illness in some circumstances.
The vaccination drive at KNH started on December 7 and will conclude this weekend.
Vaccines for the flu cost between Sh1,000 and Sh2,000 in private facilities.
In most public hospitals, they are not available.