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Other atypical mycobacteria

Other atypical mycobacteria is a topic covered in the Johns Hopkins ABX Guide.

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  • M. celatum: slow growing (3-8 wks to culture). May cause false positive M. tuberculosis direct (MTD) test.
  • M. genavense: very slow grower; difficult to grow; alert lab if M. genavense suspected.
  • M. haemophilum: slow growing; alert lab if suspected since requires hemin or iron to grow in culture and grows best at 28-30°C.
  • M. malmoense: slow growing; most clinical isolates/reports from northern Europe.
  • M. mucogenicum: rapidly grows (< 7 days in culture); sporadic contaminant in respiratory samples; water is environmental reservoir. Previously known as M. chelonae-like organism.
  • M. simiae: growth may take 4-6 weeks on LJ slants.
  • M. szulgai: scotochromagen at 37ºC, and a photochromogen at 25ºC.

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Last updated: May 30, 2016


Auwaerter, Paul. "Other Atypical Mycobacteria." Johns Hopkins ABX Guide, The Johns Hopkins University, 2016. Pediatrics Central, peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540406/all/Other_atypical_mycobacteria.
Auwaerter P. Other atypical mycobacteria. Johns Hopkins ABX Guide. The Johns Hopkins University; 2016. https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540406/all/Other_atypical_mycobacteria. Accessed April 19, 2019.
Auwaerter, P. (2016). Other atypical mycobacteria. In Johns Hopkins ABX Guide. Available from https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540406/all/Other_atypical_mycobacteria
Auwaerter P. Other Atypical Mycobacteria [Internet]. In: Johns Hopkins ABX Guide. The Johns Hopkins University; 2016. [cited 2019 April 19]. Available from: https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540406/all/Other_atypical_mycobacteria.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Other atypical mycobacteria ID - 540406 A1 - Auwaerter,Paul,M.D. Y1 - 2016/05/30/ BT - Johns Hopkins ABX Guide UR - https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540406/all/Other_atypical_mycobacteria PB - The Johns Hopkins University DB - Pediatrics Central DP - Unbound Medicine ER -