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Anti-infectious bronchitis virus (IBV) antibody titers of the different groups vaccinated with live H120 alone (group I) or in combination with CR88 (group II) at day 1. The two groups were again vaccinated with CR88 at 14 days of age. One group (group III) was kept as a control. Significantly (P < 0.05) different values are shown with different letters, and all other values were not significantly (P < 0.05) different between the groups at those sampling points.
