There were lymphoid leukosis virus and group specificantigen in the follicles with BA dying which was highest in content from the 3rd to 4th month of PI.
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。
2
By using avian influenza polyclonal antibody and H9 subtype-specific monoclonal antibody, a H9 subtype specificantigen capture ELISA was developed for detection of H9 subtype avian influenza virus.