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J Clin Microbiol. 1993 August; 31(8): 2204-2207

Simple method for production of internal control DNA for Mycobacterium tuberculosis polymerase chain reaction assays.

Department of Medical Microbiology, Royal United Hospital, Bath, United Kingdom.

ABSTRACT

A simple method for the production of internal control DNA for two well-established Mycobacterium tuberculosis polymerase chain reaction assays is described. The internal controls were produced from Mycobacterium kansasii DNA with the same primers but at a lower annealing temperature than that used in the standard assays. In both assays, therefore, the internal control DNA has the same primer-binding sequences at the target DNA. One-microgram quantities of internal control DNA which was not contaminated with target DNA could easily be produced by this method. The inclusion of the internal control in the reaction mixture did not affect the efficiency of amplification of the target DNA. The method is simple and rapid and should be adaptable to most M. tuberculosis polymerase chain reaction assays.

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