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

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.