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pulmonary nontuberculous mycobacterial disease, ontario, canada, 1998-2010.

we measured the prevalence and temporal trends of pulmonary nontuberculous mycobacterial disease among residents of ontario, canada, during 1998-2010. five-year prevalence increased from 29.3 cases/100,000 persons in 1998-2002 to 41.3/100,000 in 2006-2010 (p<0.0001). improved laboratory methods did not explain this increase, suggesting a surge in disease prevalence.