Indiana University Infectious Diseases Fellowship
21 Oct,
8 tweets, 7 min read
#idboardreview S/p minor cut while cleaning fish tank 6wks ago, pt now w/ tender nodules on hand. Ziehl-Neelsen 30°C broth +cording. Solid medium shielded light non-pigmented colonies but exposure to light: photochromogen. Dx?#IDtwitter #dermtwitter #medEd 
#Mycobacterium #marinum Dx often made via isolation of organism on culture. Growth is slow, requiring growth time of more than 7 days. Growth temperature is lower than that of many other mycobacterial species, with the optimal temperature ranging from 28 to 30°C
Ziehl-Neelsen smear of the broth can reveal cord formation; a feature which is most commonly seen with #Mycobacterium tuberculosis complex, however, it has also been described with M. #marinum
Colonies of #Mycobacterium #marinum are rough and white and become pigmented upon exposure to light.
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