Evaluation of the Bactec 960 automated nonradiometric system for isolation of mycobacteria from clinical specimens

The Bactec MGIT 960 system (Becton Dickinson, USA), designed for the culture of mycobacteria, was compared with the Bactec 460 instrument and culture on two solid egg-based media using a total of 1024 clinical specimens. Mycobacteria could be identified from 99 (9.7%) specimens, 89 (90%) of which were identified by the Bactec 960 system, 90 (91%) by the Bactec 460 system, and 82 (83%) by culture on the two egg-based media. The Bactec 960 cultures became positive an average of 16.7 days after specimen collection, the Bactec 460 cultures 14.9 days after collection, and the cultures on egg-based media 26.2 days after collection. The Bactec 960 is a compact and highly automated nonradiometric system that may replace the Bactec 460 system.