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We report a case of a patient with rheumatoid arthritis treated with low-dose methotrexate (15 mg/week) who developed infection with both M. tuberculosis and M. chelonae after the revision of a prosthetic hip.
 ( adverse event: developed ,  patient with rheumatoid arthritis: Subject, infection with both M. tuberculosis and M. chelonae: Effect, low-dose methotrexate (15 mg/week): Treatment, 15 mg/week: Treatment.Dosage, methotrexate: Treatment.Drug, rheumatoid arthritis: Treatment.Disorder) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: developed ,  patient with rheumatoid arthritis: Subject, infection with both M. tuberculosis and M. chelonae: Effect, low-dose methotrexate (15 mg/week): Treatment, 15 mg/week: Treatment.Dosage, methotrexate: Treatment.Drug, rheumatoid arthritis: Treatment.Disorder) 