Nearly 7,000 Canadians will be getting letters warning them they may have been exposed to hepatitis and human immunodeficiency virus, health officials say.Ottawa Public Health says the letters will be going out to people who had procedures at a local medical facility, the Canadian Broadcasting Corp. reported.Provincial health official Isra Levy said Saturday he did not know of any of 6,800 patients having become ill with Hepatitis B, Hepatitis C or HIV, and said the risk of infection was \"very low.\"Stressing that he is not aware of any people who have become ill, Ottawa\'s medical officer of health Isra Levy said the letters are being sent so people can be made aware of the risk.The name of the non-hospital medical facility where the \"lapses of infection control\" happened was not revealed, the CBC said.\"We don\'t know how long the problem has been going on for,\" Levy said. \"We were notified at public health earlier in the summer.\"