Four hundred and two and 1, 041 sera were collected from brood sows and fattening pigs on 40 farms in 11 prefectures respectively, and antibody titers to
Pasteurella multocida serotype A and D were examined by an indirect hemagglutination test.
By examining the 402 sows and 1, 041 fattening pigs, positive ratios of antibody to
P. multocida serotype A were 84.8% in sows and 52.9% in fattening pigs and those for the
P. multocida serotype D were 11.9% in sows and 10.8% in fattening pigs. Antibodies to
P. multocida serotype A were positive among the sows and fattening pigs raised in all of the 11 prefectures. All sows in four of the prefectures and all fattening pigs in only one prefecture were negative for antibody to
P. multocida serotype D. On the other hand, the sows showing positive antibody to
P. multocida serotype A and D were distributed in 25 of 26 farms and 13 of 26 farms, and fattening pigs showing that were distributed in 26 of 27 farms and 17 of 27 farms, respectively. On examination of fattening pigs, those younger than 3 months, 3 to 6 months and older than 6 months of age, antibody positive ratios to serotype A were 14.8%, 74.1% and 79.4%, respectively. A similer tendency was observed regarding serotype D.
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