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Abstract
At the Central Industries' laboratory in Mississippi, USA a total of 15 689 cases were diagnosed as positive for poultry diseases between 1970 and 1990. The average number of cases diagnosed per year was 784, ranging from 319 in 1974 to 1319 in 1989. A total of 52 diseases or conditions is included in the results of this survey. Each case was categorized into one of seven aetiological groups. The principal diagnosis over the 20-year period was bacterial diseases (6979 cases), followed by diseases of unknown aetiology (3660 cases), parasitic diseases (2515 cases), viral diseases (1121 cases), management errors (771 cases), nutritional deficiencies (339 cases) and fungal diseases (304 cases). Although the total incidence of disease did not appear to vary from one season to another, hot weather resulted in more skeletal diseases being diagnosed while fowl pox and ‘brooder pneumonia’ were most prevalent in cold weather. Tapeworm infestations were highest in the autumn.