There are several poultry diseases that are common in Kenya, some of which include:

1. Newcastle Disease: This is a viral disease that affects both chickens and other poultry species. It can cause respiratory problems, nervous system disorders, and mortality in severe cases.
2. Avian Influenza: This is a highly contagious viral disease that can affect both wild and domestic poultry. It can cause respiratory problems, diarrhea, and mortality in severe cases. Avian influenza is also a zoonotic disease that can be transmitted to humans.
3. Infectious Bursal Disease: This is a viral disease that affects young chickens, and it can cause immunosuppression and mortality.
4. Fowl Pox: This is a viral disease that causes skin lesions on the chicken’s head, comb, and wattles. It can also cause respiratory problems and mortality in severe cases.
5. Coccidiosis: This is a parasitic disease that affects the digestive system of poultry. It can cause diarrhea, weight loss, and mortality in severe cases.
6. Marek’s Disease: This is a viral disease that affects young chickens, and it can cause tumors, paralysis, and mortality.
7. Salmonellosis: This is a bacterial disease that affects both chickens and humans. It can cause diarrhea, fever, and mortality in severe cases. Salmonella is also a zoonotic disease that can be transmitted to humans.

It is important for poultry farmers in Kenya to implement proper biosecurity measures and vaccination programs to prevent the spread of these diseases.