2Wang J, Meers J, Spradbrow P B, et al. Evaluation of immune effects of fowlpox vaccine strains and field isolates [ J]
. Vet Micro- biol, 2006, 116: 106-119.
3Boyle D B, Heine H G. Influence of dose and route of inoculation on responses of chickens to recombinant fowlpox virus vaccines [ J ] Vet Microbiol, 1994, 41: 173-181.