Mycobacteria that form colonies clearly visible to the naked eye in more than 7 days on subculture are termed slow growers.
They can cause disease in humans.
List of slowly growing Mycobacteria
Nonchromogenic
Rough Mycobacterium africanum Mycobacterium bovis Mycobacterium leprae Mycobacterium lacus Mycobacterium lepraemurium Mycobacterium microti Mycobacterium pinnipedii Mycobacterium shottsii Mycobacterium tuberculosis
Smooth Mycobacterium branderi Mycobacterium heidelbergense Mycobacterium intracellulare Mycobacterium malmoense
Smooth to rough Mycobacterium gastri Mycobacterium haemophilum
Small and transparent Mycobacterium avium subsp. avium Mycobacterium avium subsp. paratuberculosis Mycobacterium avium subsp. silvaticum Mycobacterium genavense Mycobacterium montefiorense Mycobacterium ulcerans
Photochromogenic Mycobacterium intermedium
Yellow and smooth Mycobacterium asiaticum Mycobacterium marinum
Yellow and rough Mycobacterium kansasii
Scotochromogenic
Yellow Mycobacterium conspicuum Mycobacterium botniense Mycobacterium farcinogenes Mycobacterium heckeshornense Mycobacterium interjectum Mycobacterium kubicae Mycobacterium lentiflavum Mycobacterium nebraskense Mycobacterium palustre Mycobacterium tusciae
Yellow-orange Mycobacterium cookii Mycobacterium flavescens Mycobacterium gordonae
Rose-pink Mycobacterium hiberniae
References