With more and more multiple-drug resistant tuberculosis (MDR-TB) and extreme drug resistant tuberculosis (XDR-TB) cases getting added to the list, the Brihanmumbai Municipal Corporation and state officials are in a fix. A state official associated with tuberculosis control in the state said that they have been notified of 31 XDR-TB cases by the private labs so far. “As these laboratories are not accredited by Revised National Tuberculosis Control Programme, we are tracking the people and sending their sputum samples for confirmatory tests,” he said.