Histologic Incidence and Distribution of Cryptosporidium sp. Infection in Chickens: 68 Cases in 1986

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Abstract
In 1986, a retrospective examination of histologic data determined that 68 histology accessions at the Georgia [USA] Poultry Laboratories had a diagnosis of cryptosporidiosis. These cases represented 6.4% of the 1065 histologic examinations of chickens performed at that facility. Of the protozoaninfections, only Eimeria sp. was diagnosed more frequently (105/1065 = 9.9%). Infected chickens came from 11 components. Most of the cases were significantly (.chi.2 = 103, df = 10, P < 0.001) associated with two of these companies. These chickens ranged in age from 14 to 51 days. The number of cases per age group was significantly correlated (r = 0.85, t = 3.98,d f = 6, P < 0.01) with the number of cases per age group of the population of histology accessions. Additionally, cases of cryptosporodiosis had a significantly (P < 0.05) uneven temporal distribution in that few cases were diagnosed during the winter.