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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
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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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