[Phage typing of Mycobacterium tuberculosis using the overlay technique. Preliminary study].

One hundred and fifty strains of Mycobacterium tuberculosis were classified by the phagotyping technique, using the double layer method described by Adams and modified by Jones. The efficacy of this method was studies in comparison with the method claimed by Redmond and Ward and traditionally employed for Mycobacteria typing. Preliminary Results obtained have allowed to prove its advantages. A 96% of coincidence with respect to the traditional method was reported.