For the active immunisation of cattle and sheep against disease associated with infections caused by Clostridium chauvoei (Blackleg and post-parturient gangrene) Significant levels of immunity cannot be expected until two weeks after the second dose of vaccine in the primary vaccination course. From experience from field use, the duration of active immunity is expected to last one year. The duration of passive immunity is at least 4-6 weeks in lambs, provided that lambs receive adequate quantities of colostrum in the first 12 hours after birth.
Blackleg has been recognized as a livestock disease since before medieval times, and today we often use the term loosely to describe several diseases caused by organisms in the Clostridium class of bacteria. However, there are more than 60 different types of Clostridium bacteria, and not all cause disease
Blackleg is a fatal disease of young cattle. It produces an acute local infection, and the resulting blood poisoning leads to rapid death. The name ‘blackleg’ derives from the fact that the site of infection is often a leg muscle, and that the affected muscle is dark in colour. Although the disease is widely distributed in New South Wales, most losses from blackleg occur in the eastern half of the state. In some areas the disease may appear on several properties, while in other areas only isolated farms are affected. Sometimes, only part of a property is affected.
Features of Blackleg Vaccine
Most vaccinated animals may experience reactions to vaccination. These reactions are usually localised swelling (up to 14 cm in diameter, which resolves in less than 10 weeks) or induration at the injection site but may also include abscess (in up to 17% of animals) or other reaction in underlying tissues at the injection site.
Skin discolouration (which returns to normal as the local reaction resolves) and localised pain for 1-2 days post first vaccination may occur at the injection site. The local reactions do not affect the general health, demeanour, feeding or weight gain of the animals.
No information is available on the safety and efficacy from the concurrent use of this vaccine with any other. A decision to use this vaccine before or after any other veterinary medicinal product therefore needs to be made on a case by case basis.
Dosage & Administration
The vaccine should be administered by subcutaneous injection in the lateral side of the upper neck observing aseptic precautions.
Cattle and sheep: 2 ml/dose.
- Two injections separated by an interval of 3-4 weeks to animals from 3 months of age onwards.
- Immunisation to be completed 2-3 weeks before the period of risk.
- Revaccination with a single booster injection 2-3 weeks before the period of risk.
- The interval for booster injections should be no more than 12 months.
- Two injections should be given, preferably separated by an interval of at least 6 weeks, with the second vaccination being given 3-4 weeks before lambing.
- ubsequent pregnancies: a single booster injection 3-4 weeks before lambing.
- Ewes can be vaccinated during late pregnancy.
- Lambs may be vaccinated from 3 weeks of age onwards: two injections with an interval of 3-4 weeks to be completed 2-3 weeks before the period of risk.
Prices of Blackleg Vaccine
$ 27.13- $ 94.27