A visiting clinician tested positive to methicillin resistant Staphylococcus Aureus (MRSA) and the hospital acted to stop the bacteria spreading.
West Coast District Health Board community liaison officer Bryan Jamieson said all operating theatres had been swabbed, cleaned and swabbed again.
All staff and any patients who had come into contact with the clinician had also been tested.
Mr Jamieson said it took a couple of days to get results back as cultures had to be grown from swabs but nobody had shown symptoms of infection.
"We are hopeful that if everything tests out fine we will return to normal on Monday," he told NZPA.
With no surgeries scheduled over the weekend, it was only Friday's procedures which were affected, "and all those people will be rescheduled as soon as we can fit them in".
"Realistically we're just being as vigilant as we can be. There hasn't been a problem with a patient at all but once you detect this you have to go through all the steps to make sure it doesn't become a problem."
MRSA was not an uncommon infection but could pose an increased threat in hospitals.
"The problem is around areas of open wounds and obviously those people who are recovering and recuperating probably don't have the same resiliency as the rest of the public have."
The clinician has been notified and treated.
