The union representing nurses in Manitoba is concerned about security risks for its members following a ransomware attack that has impacted some maintenance systems at the province’s largest hospital. Darlene Jackson, president of the Manitoba Nurses Union, says it is troubling that the breach is affecting some of the door access at Winnipeg’s Health Sciences Centre after the union declared the hospital too dangerous to work at last year because of safety concerns.Shared Health, the body that manages health care in the province, announced on Monday that it was dealing with an attack affecting certain facility maintenance systems, including heating,…