According to CJAD over 150 patients who had bariatric surgery at Lachine could be infected with HIV and hepatitis due to improper sterilization of a liver retractor. Involves patients operated on between 2009 and 2014.
Correction, the dates were from 2012 to 2014. Here's the link.
http://www.cjad.com/cjad-news/2014/07/29/150-lachine-patients-at-risk-of-infection-following-surgery
