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- W2002645911 abstract "A small but significant reduction in the number of Mycoplasma dispar colonising the respiratory tract after intratracheal challenge was observed in gnotobiotic-calves previously inoculated subcutaneously three times with formalin-killed organisms and oil adjuvant. Injection of M. dispar by the intramuscular route, with oil adjuvant, and 2 weeks later by the intratracheal route, without adjuvant, failed to induce immunity to subsequent intratracheal challenge. Following the subcutaneous injection of killed M. dispar, the amount of antibody detected by single radial haemolysis (SRH) increased markedly with increasing age in groups of calves with average ages of 16 to 155 days when first injected. Most calves aged less than 40 days failed to produce an antibody response to a singel injection of M. dispar. With M. bovis a smaller difference was observed between antibody levels generated in calves of different ages; also, calves less than 40 days old produced a detectable SRH antibody response following a single injection of killed M. bovis. IgG1 and IgG2 antibody to M. dispar and M. bovis were measured by ELISA. IgG1 appeared before IgG2 antibody and this was particularly pronounced in younger calves. Also, for both mycoplasmas IgG2 antibody levels were lower in younger than older calves. The IgG1 response to M. dispar was compared in three groups of calves with average ages of 16, 55 and 155 days and was greatest in the oldest and least in the youngest animals. In contrast, the IgG1 response to M. bovis varied little in calves of different ages. It therefore appears that the immune response of young calves to M. dispar is impaired or defective." @default.
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- W2002645911 title "Immune response of calves following the inoculation of Mycoplasma dispar and Mycoplasma bovis" @default.
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- W2002645911 doi "https://doi.org/10.1016/0378-1135(83)90018-4" @default.
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