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  • Title: Western blot analysis of the IgG response of sheep vaccinated with S48 Toxoplasma gondii (Toxovax).
    Author: Wastling JM, Harkins D, Buxton D.
    Journal: Res Vet Sci; 1994 Nov; 57(3):384-6. PubMed ID: 7871261.
    Abstract:
    The IgG antibody responses of sheep vaccinated by the subcutaneous injection of live tachyzoites of 'incomplete' strain S48 toxoplasma (Toxovax) were analysed by Western blotting. Antibodies corresponding to a range of tachyzoite antigens (13 to 48 kD) were detected, but the response was dominated by antibody recognising a 30 to 32 kD band. Unvaccinated ewes challenged orally with oocysts of the 'complete' M3 toxoplasma strain had a more complex IgG response that recognised antigens in six dominant bands of similar intensity as those in sheep vaccinated with S48 tachyzoites and then challenged with M3 oocysts. No differences were detected between the antigenic structures of the S48 tachyzoites and RH strain tachyzoites when the antigens were probed with immune ovine sera. Many of the anitgens of the S48 tachyzoites that were recognised had molecular weights similar to those of antigens that have been identified in other strains of toxoplasma.
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