Figure 1:

Onset of active tuberculosis (TB) relative to time of immigration among applicants for permanent residency (A) from within Canada and (B) overseas, 2002–2011. Bars with negative time values represent TB cases reported among people born abroad before they became permanent residents (55.6% of patients among in-Canada applicants). Among overseas applicants, bars with negative time values represent temporary residents, visitors and other people born abroad in whom active TB developed while in Ontario, who then left Canada, applied for permanent residency overseas and subsequently returned to become permanent residents in Ontario. Bars with positive time values represent TB cases among permanent residents stratified by whether they were referred for postimmigration surveillance.