Kienyeji chickens, like all chickens, are susceptible to various diseases and health issues. Some of the common diseases in Kienyeji chickens and their treatments include:

1. Newcastle Disease: A highly contagious viral disease that causes respiratory and nervous symptoms. Treatment involves administering antiviral drugs and providing supportive care to the affected birds.
2. Avian Influenza: A viral disease that can cause respiratory, digestive and nervous symptoms. Treatment involves administering antiviral drugs and providing supportive care to the affected birds. In severe cases, culling of infected birds may be necessary to prevent the spread of the disease.
3. Fowl Pox: A viral disease that causes skin lesions and affects the respiratory system. Treatment involves administering antiviral drugs and providing supportive care to the affected birds.
4. Coccidiosis: A parasite infection that affects the digestive system and causes diarrhea. Treatment involves administering antiparasitic drugs and improving the hygiene of the living environment.
5. Worm infestations: Common worm infections in chickens include roundworm and tapeworm. Treatment involves administering antiparasitic drugs and improving the hygiene of the living environment.

It is important to regularly monitor the health of your Kienyeji chickens and to seek veterinary advice if you suspect any health issues. Preventive measures, such as regular vaccination and deworming, can also help to reduce the risk of disease in your flock.