Friday, March 28, 2003 LOCKDOWN Strict health rules declared across T.O. By ROB GRANATSTEIN, TORONTO SUN Toronto has become a hot zone for SARS as Ontario's top doctors step up their mad rush to choke off the spread of the illness before it smothers the city. Under an emergency plan that changes by the day, visitors have been banned from all Toronto hospitals, the province has bought every surgical mask for sale in Canada and the World Health Organization called for all passengers boarding international flights at Pearson airport to be screened for SARS. As the number of cases and...