Protection conferred by bivalent and trivalent infectious coryza bacterins against prevalent serovars of Avibacterium (Haemophilus) paragallinarum in Mexico.
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.
Fernández
R P
RP
Centro de Investigación y Estudios Avanzados en Salud Animal, Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México, Instituto Literario No. 100, Toluca, México.
Colíndres
H L
HL
Velásquez
Q E
QE
Soriano
V E
VE
Blackall
P J
PJ
D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D001428:Bacterial Vaccines / Q000008:administration & dosage*; D002645:Chickens / Q000276:immunology* / Q000382:microbiology*; D006192:Haemophilus Infections / Q000382:microbiology / Q000517:prevention & control / Q000662:veterinary*; D044134:Haemophilus paragallinarum / Q000145:classification / Q000276:immunology* / Q000472:pathogenicity; D006385:Hemagglutination Inhibition Tests; D008800:Mexico; D011201:Poultry Diseases / Q000382:microbiology / Q000517:prevention & control*; D012703:Serotyping
D000907:Antibodies, Bacterial; D001428:Bacterial Vaccines