(Vancouver, WA)  --  Clark County health officials say some patients and staff may have been exposed to hepatitis C at Peacehealth Southwest Medical Center in Vancouver.  The health department says it may be two weeks before test results on the extent of the exposure are received.  Officials say the risk is low that anyone was exposed to hepatitis C.  A list of people who may have been exposed is being developed, and those people will be notified and tested at the hospital's expense.