HIV--621x414A Long Island hospital is sending out more than 4,000 letters to patients recommending that they be tested for hepatitis and HIV because of the risk that they may have been exposed to the diseases via an insulin pen.  CBS New York reports that the letters from South Nassau Communities Hospital said patients may have received insulin from an insulin pen reservoir that could have been used more than once. The hospital says the needles themselves were never reused. Hospital spokesman Damian Becker said no one was observed reusing the insulin pen reservoir, but a nurse was heard saying it was all right to do so. He says the hospital was recommending testing out of an “abundance of caution.” MORE