An evaluation of the cross-protection afforded by inactivated infectious coryza vaccines [Haemophilus paragallinarum]
1991
Blackall, P.J. (Queensland Dept. of Primary Industries, Yeerongpilly (Australia). Animal Research Inst.)
In tests of 3 vaccines on 4 groups of 26-week-old chickens, serovar C-2 and serovar C-4 vaccines protected more than 50 percent of the birds against either a serovar C-2 or C-4 challenge while serovar A-4 vaccine protected less than 50 percent of birds.
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