Ahead of the NSW state election on 25 March 2023, the NSW Government caretaker period has commenced. Limited updates will be made to this website during this period.
Almost all vaccination programs (particularly those using killed vaccines) require two doses for vaccination to be effective. It is, however, still common practice for producers to vaccinate only once or whenever they perceive the risk of disease may be high rather than adopting a set program.
This Agnote explains how vaccines work to help producers accept the need for a booster vaccination.