3Oliveira S,Galina L,Pijoan C.Development of a PCR test to diag2 nose Haemoph-ilus parasuis infections[J].J Vet Diagn Invest,2001,139(6):495 501.
4Kielstein P,Wuthe H,Angen O,et al.Phenotypic and genetic characterization ofNAD2dependent Pasteurellaceae from the respira2 tory tract of pigs and their possiblepathogenetic importance[J].Vet Microbiol,2001,81(3):243-255.