Five people have died of Rift Valley Fever in Kenya in the past week.
Report says its the first re-emergence of the disease since an outbreak a decade ago which killed more than 200 people.
The latest cases were in all the north-eastern county of Wajir.
The viral disease is mainly spread to humans through contact with the blood or meat of infected animals.
Ban sales of meat
Officials in Wajir have banned the sale and consumption of meat and milk for 10 days in an attempt to contain the spread of the disease.
There is no effective human vaccine for Rift Valley Fever, which can cause victims to become blind and sometimes bleed to death.
Last month, the government warned of a possible outbreak after months of heavy rainfall.