Two outbreaks of influenza were diagnosed in two turkey breeder flocks raised in consecutive years on an Ohio farm that also had a swine operation. The antibody detected indicated that the virus causing the disease had the Hswl hemagglutinin (swine influenza). Signs of disease onset were a decline in egg production and an increase in the number of abnormal eggs. Antibodies against the Hswl hemagglutinin were detected in swine raised on the farm.
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Mohan et al. (1981) studied this question.