2Mohamed Hasan Bikour, Estela Cornaglia and Youssef Elazhary. E- valuation of a protective immunity induced by an inactivated influen- za H3N2 vaccine after an intratracheat challenge of pigs [ J]. Can J Vet Res, 1996, 60(4) : 312-314.
3Kristien Van Reeth, Geoffrey Labarque, Sophie De Clereq and Mau- rice Pensaert. Efficacy of vaccination of pigs with different HI N1 swine influenza viruses using a recent challenge strain and different parameters of protection [J]. Vaccine, 2001, 19 ( 31 ) : 4479 -4486.
4Manieassamy B, Medina R A, Hai R, et all. Protection of mice a- gainst lethal challenge with 2009 H1N1 influenza A virus by 1918- like and elassieal swine HI N1 based vaccines [ J]. PLo S Pathog, 2010, 6(1) : e1000745.
