الفهرس 
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Abstract
The present study was carried out on 108 ducks and 62 geese collected from different localities of Gharbia governorate. Respiratory manifestations in ducks and diarrhoae in geese were recorded. The incidence of coccidiosis (I. parvula and ~. nocens) was 5.5% and 8% in ducks and geese respectively while cryptosporidiosis was 26.8% in ducks and 27.8% in geese. In both ducks and geese the incidence of coccidiosis and cryptosporidiosis was decreased with advancement of age. Incidence was high in summer and low in both autumn and winter seasons. Naturally infected ducks and geese with coccidiosis showed clinical sitgns in the form of loss of appetite, emaciation, listlessness and watery to bloody diarrhoae. The postmortem findings were catarrhal enteritis, excessive mucous with hyperaemic enteritis and in some cases hemorrhages and thickening of intestinal mucosa. The clinical signs of the infected birds with cryptosporidiosis were respiratory manifestations in ducks and diarrhoae in geese and the oocysts coLild be detected in the faeces of experimentally infected ducks on the 4ffl day post inoculation. The post mortem findings of naturally infected ducks were rhinitis and tracheitis while geese showed slight catarrhal enteritis and bursitis in some cases. Geese cryptosporidjal oocysts succeded to induce clinical disease in ducks at the 5th day postinoculation. The histopathologcial changes of experimentally infected ducks and naturally infected geese showed the presence of oocysts in the brush bordser of epithelial lining of’ trachea in ducks and in the interstine of geese with cellular infiltration. CONCLUSION Cryptosporidiosis is a disease that affect both ducks and geese. The clinical signs in ducks were respiratory manifestations while the affected geese showed entritis. Young ages were more severely affected than adults. The disease was more prevalent in summer and spring seasons than in autumn. The cryptosprodiosis of geese could be transmitted to ducks producing clinical disease.