BA法染色表明法氏囊一直存有病毒和群特异性抗原，以接毒后3～4个月含量最高。
There were lymphoid leukosis virus and group specific antigen in the follicles with BA dying which was highest in content from the 3rd to 4th month of PI.
VP7蛋白在病毒的各蛋白中最保守，是病毒的血清群特异性抗原。
VP7, the most conserved protein of the virion, is serogroup-specific antigen.
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