DoH advise there has been a change in the Australian Technical Advisory Group on Immunisation (ATAGI) advice, stating that the preferred minimum interval between receipt of a COVID-19 vaccine and any other vaccine, including the influenza vaccine, is 7 days.

A shorter interval (i.e. less than 7 days, including co-administration) is acceptable in the following settings:
• increased risk of COVID-19 or another vaccine-preventable disease (e.g. COVID-19 outbreak, influenza outbreak, tetanus-prone wound); or
• logistical issues e.g. difficulty scheduling visits to maintain the 7 day interval.
This advice has been updated on the DoH Clinical considerations page, and all other relevant webpages.