The Niagara Health System has declared more C. difficile infections in one of its hospitals in southern Ontario, less than two months after the last outbreak.

Three patients have been diagnosed with the potentially deadly superbug in one unit of the Greater Niagara General Hospital.

The health system has tracked a series of outbreaks in its hospitals, with the latest declared over in late October. A total of 102 people were infected and 37 died during the course of the outbreak.

"Everyone is working extremely hard to follow best practice with our infection prevention and control protocols, and it is disappointing to be in outbreak on Unit D," said Kim Stephens-Woods, vice-president Patient Services.

Health authorities said C. difficile is a reality for all hospitals, but what is unusual is the increasing number of people arriving at the hospital already carrying the bacteria.