Purified inactivated influenza virus vaccines are made from processed parts of killed influenza virus particles. They are currently the only type of flu vaccine available in Australia. There are two types of inactivated influenza virus vaccines; split virion vaccines or subunit vaccines. The difference relates to the way the inactivated virus is processed. Subunit and split virion vaccines have the same safety and effectiveness. In the past, whole inactivated viruses were used in vaccines, however some people reacted poorly to these, so they are no longer used in Australia.
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