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  • Title: Protection of vaccinated pigs against experimental infections with homologous and heterologous Haemophilus parasuis.
    Author: Bak H, Riising HJ.
    Journal: Vet Rec; 2002 Oct 26; 151(17):502-5. PubMed ID: 12430998.
    Abstract:
    The efficacy of a new Haemophilus parasuis vaccine for pigs was investigated. The vaccine contains H parasuis serotype 5 cells and is adjuvanted with Diluvac Forte (Intervet). Groups of pigs were vaccinated at five and seven weeks with 2 ml and their littermates served as unvaccinated controls. The vaccinated pigs were protected against a challenge with another strain of Hparasuis serotype 5 at two, eight and 17 weeks after the second vaccination, whereas the controls became very ill. The susceptibility of the pigs to the infection decreased with increasing age. After a heterologous challenge with H parasuis serotypes 1, 12, 13 and 14, two weeks after the second vaccination, the vaccine also gave clear protection. The severity of the illness among the control pigs differed with the different serotypes.
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