The Reserve Bank will keep all cash coming back to it for at least 14 days for hygiene reasons as it sits on a supply of more than two years.
Christian Hawkesby, assistant Reserve Bank governor, said it made the decision in February to quarantine cash which comes back to it from the banks.
Globally there has been concerns sparked about the potential for cash to spread the coronavirus and some speculative stories in China have pointed to people physically washing money to ensure it is clean.
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But Hawkesby said cash should be treated like any other surface.