"John Cochran VA Medical Center in St. Louis has recently mailed letters to 1,812 veterans telling them they could contract hepatitis B, hepatitis C and human immunodeficiency virus (HIV) after visiting the medical center for dental work, said Rep. Russ Carnahan."
There have been civilian hospitals, doctors and dentists who've had similar problems. One of the early and well publicized AIDS victims was a young lady who got the virus from a dentist (Florida IIRC)? And hospitals have had the odd nurse who decides that killing off the suffering is his or her duty, and medication mistakes happen in civilian hospitals.
None have a perfect record.