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111.
David C. Straus Charles W. Purdy Raymond W. Loan Robert F. Briggs Glynn H. Frank 《Current microbiology》1998,37(4):240-244
Pasteurella haemolytica (Ph) is the most important cause of the bovine acute fibrinohemorrhagic pneumonia that occurs in market stressed calves after
shipment to feedyards. Recent characterization of neuraminidase production by these organisms has shown that all 16 serotypes
produce an immunologically similar form of the enzyme. Anti-neuraminidase antibody against PhA1 and PhA6 was determined in
101 2- to 5-month-old calves, on their farms of origin, at the order buyer barn (OBB), and through 28 days in the feedyard.
Half of the calves were vaccinated with a killed Ph serotype-A1 (PhA1) product. Nasal secretion and tonsil wash specimens
were cultured for Ph and Pasteurella multocida (Pm). Serum antibody against PhA1 and PhA6 was measured by indirect hemagglutination (IHA), and anti-neuraminidase antibody
was determined by the neutralization assay. At the feedyard, 73 calves had respiratory tract disease. IHA values ranged between
1:2 and 1:1024 for PhA1 and between 1:2 and 1:512 for Ph serotype A6 (PhA6). Forty-two, 24, and 28% of the calves were infected
with PhA1, PhA6, and Pm, respectively. Ninety-six percent of the calves experienced an increase in anti-PhA1 neuraminidase
antibody when sera drawn on feedyard day 28 were compared with sera drawn on the farm. These data demonstrate that the enzyme
neuraminidase is produced in vivo in market stressed cattle after a natural Ph infection.
Received: 23 March 1998 / Accepted: 4 May 1998 相似文献