Reasons why 50 patients did not meet the 2007 ATS/IDSA diagnostic criteria for M. kansasii disease.

*Two patients were diagnosed with mixed infection (M. avium complex and M. abscessus).**Pulmonary tuberculosis was demonstrated by the presence of an M. tuberculosis culture isolate or by polymerase chain reaction.†Of these patients, 18 (78%) underwent follow-up without antibiotic treatment for a median duration of 12.1 months (interquartile range 4.4–32.0 months). None of these patients developed M. kansasii lung disease.Reasons why 50 patients did not meet the 2007 ATS/IDSA diagnostic criteria for M. kansasii disease.