Excessive sample reagent incubation time increases the risk of false rifampin resistance results in Xpert(R) MTB/RIF Ultra tests performed on paucibacillary Mycobacterium tuberculosis sputum.
A high rate of false rifampicin resistance (RIF-R) was recently reported in paucibacillary sputum samples tested with the Xpert(R) MTB/RIF Ultra (Ultra) as