SEATTLE (AP) -- A Seattle hospital is advising 27 patients to undergo HIV and hepatitis testing after finding that some equipment was not properly sterilized.

The Seattle Times reports that Swedish Medical Center believes the risk of infection is extremely low. Swedish spokesman Clay Holtzman says staff members followed three of four sterilization steps with the equipment used in prostate procedures.

Holtzman said Swedish discovered earlier this month that staff at the First Hill hospital campus hadn't been doing the fourth step, which involves dousing the equipment in a sterilizing fluid. The errors occurred Sept. 19 and Dec. 10.

Holtzman said the hospital notified patients Friday and is providing the tests for free.

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