Abstract
AT THE present time, chronic respiratory disease (CRD) of chickens is generally considered a major source of financial loss to poultrymen. Since the disease was first described (Delaplane and Stuart, 1943) it has become enzootic in every poultry producing area in Canada and the United States. In view of its economic importance and widespread distribution it is evident that measures must be taken either to eradicate or control this disease. Only recently was sufficient information regarding the etiology and mode of transmission obtained to make suggestions for the control of CRD feasible. It is the purpose of this paper to present the data which enables one to propose a plan for the control of CRD.PART 1Review of Pertinent FactsIncidence. Exact data concerning the incidence of the disease in the United States is not available, but all information points to an extremely high attack rate, especially in areas …
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