a City and Hackney Primary Care Trust, St Leonard’s Hospital, Nuttal St, London, England. b Tuberculosis Programme, Pan-American Health Organization, Washington, DC, United States of America. Correspondence to Jose Figueroa-Munoz (e-mail: [email protected]). doi:10.2471/BLT.06.038737 (Submitted: 12 November 2006 – Revised version received: 1 August 2007 – Accepted: 10 August 2007 – Pu...