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  • Title: Parenteral vaccination of calves against the cattle lungworm Dictyocaulus viviparus.
    Author: Bain RK, Urquhart GM.
    Journal: Res Vet Sci; 1988 Sep; 45(2):270-1. PubMed ID: 2973642.
    Abstract:
    Protection against challenge with Dictyocaulus viviparus larvae was studied in two groups of calves. The first group was vaccinated orally with an irradiation-attenuated larval vaccine on two occasions, 28 days apart, as recommended by the manufacturer. Each dose contained 1000 larvae. The second group was vaccinated by two subcutaneous injections of vaccine, also 28 days apart. Compared with unvaccinated calves the protection in both groups of vaccinated calves was similar, ie, over 95 per cent reduction in adult worm burdens after an oral challenge of 3000 to 4000 larvae. These results indicate that the passage of irradiated larvae through the intestine and mesenteric lymph nodes is not necessary for the stimulation of a high degree of immunity and opens up the possibility of parenteral vaccination against this and related diseases.
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