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1 December 2005 Protection Conferred by Bivalent and Trivalent Infectious Coryza Bacterins Against Prevalent Serovars of Avibacterium (Haemophilus) paragallinarum in Mexico
R. P. Fernández, H. L. Colíndres, Q. E. Velásquez, V. E. Soriano, P. J. Blackall
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Abstract

The protection and level of hemagglutination-inhibition (HI) antibodies conferred in infectious coryza bivalent- and trivalent-immunized chickens against Avibacterium (Haemophilus) paragallinarum field isolates of the prevalent serovars in Mexico (A-1, A-2, B-1, and C-2) were investigated. The bivalent bacterin (A-1 and C-1) conferred significant protection and increased HI antibodies against isolates of serovars A-1, A-2, and C-2, but not against a serovar B-1 isolate. The trivalent bacterin (A-1, B-1, and C-2) conferred protection and increased HI antibodies against all four of the isolates. The results confirmed that in poultry areas where serovar B-1 is prevalent, the inclusion of this serovar in bacterins is needed to confer protection against infectious coryza caused by A. (H.) paragallinarum isolates of serovar B-1.

R. P. Fernández, H. L. Colíndres, Q. E. Velásquez, V. E. Soriano, and P. J. Blackall "Protection Conferred by Bivalent and Trivalent Infectious Coryza Bacterins Against Prevalent Serovars of Avibacterium (Haemophilus) paragallinarum in Mexico," Avian Diseases 49(4), 585-587, (1 December 2005). https://doi.org/10.1637/7355-031405R1.1
Received: 14 March 2005; Accepted: 1 July 2005; Published: 1 December 2005
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