TORONTO (AP)--The number of probable SARS cases in Canada's largest city could be 60 or more, a leading figure in Toronto's efforts to contain the disease said Thursday. Dr. Donald Low said health officials were likely to designate more patients as probable cases of severe acute respiratory syndrome when they apply a broader definition of the diagnosis to a new outbreak first noticed last week. Officials worry the World Health Organization could issue another warning against travel to the city, like one on April 23 that was lifted a week later. Dr. Colin D'Cunha, the Ontario commissioner of public health,...