Strains of a new type of slowly growing scotochromogenic mycobacterium were isolated repeatedly from sphagnum vegetation and surface water of moors in New Zealand. These strains grew at 31 and 22°C but not at 37°C and possessed catalase, acid phosphatase, and arylsulfatase activities. They did not split amides, and most of them were susceptible to antituberculotic drugs. Furthermore, they did not tolerate 0.1% NaOH and 0.2% picric acid and did not grow on compounds used as single carbon sources and single nitrogen and carbon sources. The internal similarity of the strains as determined by numerical taxonomy methods was 96.6% ± 3.09%. The whole-mycolate pattern is unique in that it has not been found previously in 23 species of slowly growing mycobacteria. Evaluation of long-reverse-transcriptase-generated stretches of the primary structure of the 16S rRNA confirmed that these organisms belong to the genus The phylogenetic position of these bacteria is unique; they are situated between slowly growing pathogenic and rapidly growing saprophytic species. The strains are not pathogenic for mice, guinea pigs, and rabbits, but they provoke a nonspecific hypersensitivity reaction to bovine tuberculin. Hence, they are considered members of a new species of nonpathogenic, slowly growing mycobacteria, for which the name is proposed. Strain NZ2 is the type strain; a culture of this strain has been deposited in the American Type Culture Collection as strain ATCC 49103.


Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error