Systematic Veterinary Bacteriology and Mycology

CONTROL AND PREVENTION

• Before the lambing season the ewes are vaccinated with formalised whole culture or alum precipitated vaccine.
• The resulting passive immunity, with unweaned lambs, derived from colostrum protect lambs for first 3 weeks of life.
• Similarly alum precipitated trypsin –treated toxoid is also satisfactory.
• Lambs can also be vaccinated by giving the first dose within 72 hrs of birth and repeated at 4 weeks of age.
• Immunity may not last more than 6-12 months unless booster dose is given.