Coccidiosis In Budgerigars

Coccidiosis

By Dr Rob Woodhead, December 2025 (Single cell animal) – Common protozoal infection of budgerigars.

SYMPTOMS	Mildly affected birds may show no signs. Others exhibit listlessness, diarrhoea, weight loss, dehydration, death. Blood may be seen in droppings from badly affected birds. Many birds may die in 2–3 days, up to 80%.
LIFE CYCLE	Ingestion of fertile oocysts with faeces which rupture in the intestine releasing multiple immature coccidian which burrow into the cells of the intestinal lining where they multiply further rupturing the cells which release the coccidian into the gut and, at the same time, destroy the gut lining. Because large numbers of eggs can be passed by a single infected bird, a rapid buildup of infection can occur in the aviary and many deaths may result. Warm humid climatic conditions facilitate the disease. Young birds are more prone due to their weak immune system. Overcrowding and poor hygiene will increase the spread of the disease.
DIAGNOSIS	Oocyst in faeces (intermittent shedding) – microscope
TREATMENT	Baycox 3ml/litre for 5 days. Repeat after 7 days for 3 days. New food and clean water daily. Add an antibiotic to the drinking water with the Baycox for 7 days.
CONTROL	Baycox for 3 days every 3 months.