Several strains of Mycobacterium and Nocardia were stained for acid fastness by using the method of Kinyoun. Duplicate, glutaraldehyde-fixed smears were extracted with fresh pyridine prior to staining. The results clearly demonstrated that both in vivo- and in vitro-grown Nocardia differed from Mycobacterium by becoming nonacid fast after extraction. This pyridine extraction of nocardial acid fastness should have diagnostic and taxonomic application.
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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/4127425