Incidentally
"The name Lock Hospital dates back to earlier leprosy hospitals, which were known as ?lock? hospitals derived from the French loques, the rags that were used to cover the leper?s lesions. ?Lock Hospitals? were developed specifically for the treatment of syphilis, a sexually transmitted infection."
http://rcpilibrary.blogspot.ie/2013/11/westmoreland-lock-hospital.html
Jim Carroll