The Hawke's Bay District Health Board says it has made contact with all but one person at risk from surgical equipment that wasn't properly sterilised earlier this month.
Hawke's Bay District Health Board chief executive Kevin Snee told media the equipment was used in operations between February 2 and 11.
While the batch of equipment was cleaned under hot water and dried, it did not pass through a final sterilisation process before being distributed for use.
It was a diverse tray of equipment, used in both theatre and the hospital's community block. A wide range of procedures would have been carried out, including dental.
In a release today, the Hawke's Bay DHB said that, "22 people attended outpatient clinics today, and the remainder who want to attend a clinic will be seen tomorrow. A councillor has also been offered as part of the clinic, but so far no-one has taken the service up."
The DHB says the investigation into the event has begun, and is expected to take some weeks to complete.
Executive Director Provider Services Dr Colin Hutchison says the risk of infection to patients involved was extremely remote.