Slowly growing Mycobacteria#Photochromogenic

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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.{{cite journal | doi = 10.1001/archderm.139.5.629 | pmid = 12756100 | volume=139 | issue=5 | title=Rapidly growing mycobacterial infections after pedicures |date=May 2003 | journal=Arch Dermatol | pages=629–34| doi-access= | last1 = Sniezek | first1 = Patrick J. | last2 = Graham | first2 = Brad S. | last3 = Busch | first3 = Heidi Byers | last4 = Lederman | first4 = Edith R. | last5 = Lim | first5 = Matthew L. | last6 = Poggemyer | first6 = Kimberly | last7 = Kao | first7 = Annie | last8 = Mizrahi | first8 = Moise | last9 = Washabaugh | first9 = Gerry | last10 = Yakrus | first10 = Mitch | last11 = Winthrop | first11 = Kevin }}