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BUFFALO, N.Y. (WIVB/CNN) - Twenty veterans have now tested positive for hepatitis after a veteran's hospital in Buffalo admitted to reusing insulin pens on patients.

The hospital says about 700 patients were reportedly put at risk of contracting a blood-borne illness.

Congressman Chris Collins pointed the finger at Secretary of Veterans Affairs Eric Shinseki, and the rest of the VA's Washington leadership.

"I believe the secretary should be relieved of his job; I believe the undersecretary should be relieved. You have to clean house at some point in time, to bring someone in who says, 'Veterans come first," said Collins.

Despite the positive test results, health officials say there is no way of knowing if the patients contracted hepatitis from the reuse of the insulin or from another source.

Of the 716 veterans who may have been exposed, 174 have already passed away.