[Use of native and lyophilized Loewenstein-Jensen's solid media in determining drug resistance on mycobacterium tuberculosis strains]

The results of determination of drug medium depend on both individual cultural properties of the strains tested and the type of the medium used. The composition of a medium is of significance for some strains: the latter grow in any medium and are characterized by the same spectrum of resistance. However, most drug-resistant strains have higher feeding demands which are not fully met on the lyophilized Löwenstein-Jensen medium. The strains in the lyophilized medium show an incomplete spectrum of resistance and less grow than do those in freshly prepared Löwenstein-Yersen medium.