Vaccination lesions

General description
  • Vaccination lesions are reactions, such as an abscess or scar tissue, at vaccination sites.
  • Sheep vaccinated with the Gudair® OJD vaccine often develop a large vaccination reaction at the injection site.
  • Incorrect vaccination technique, e.g. not placing the injection correctly.
  • Vaccinating wet sheep.
  • Unhygienic vaccination equipment/processes.
Clinical signs
  • Firm swelling usually develops at the site of injection, followed by a nodule 7–15 days later.
  • In a small proportion of animals, the lump may be more than 5cm in diameter or develop into an abscess and burst, which may predispose to flystrike.
  • Correct vaccination technique.
  • Generally, vaccine can be administered subcutaneously high on the neck behind the ear. Check vaccine for correct administration details before vaccinating animals. 
  • Producers should avoid vaccinating sheep which will be slaughtered as lambs.
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