Two sisters in southwest Nova Scotia still can't quite believe how quickly they lost their parents, who died within a couple of hours of each other after contracting a rare infection.

Meta and Sammi Ross want people to know about the danger of invasive group A strep, or iGAS, a contagious bacterial infection that can progress rapidly.

Group A streptococcus is a family of bacteria that can cause common illnesses, such as strep throat. 

But in rare cases, it can cause more serious infections by movi…