| 摘要 |
A vaccine far use to treat or prevent a disease in a vertebrate, the vaccine comprising an antigenic entity and a carrier, the antigenic entity being adapted to cause, following vaccination of the vertebrate with the vaccine, an immune response providing antibodies which inhibit a factor from a pathogen which directly or indirect ly causes breakdown of protein in the vertebrate wher- ein said breakdown enhances growth of the pathogen. A vaccine against the streptokinase of Streptococcus uberis can be used to prevent mastitis in cattle,
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