Human urine normal flora -Reply

Alan Junkins junkinsa at SMTPGW2.MUSC.EDU
Sun Jan 18 12:45:39 EST 1998


Normal human urine is sterile when it's in the bladder.  But as
it passes through the urethra it will pick up some normal flora.
 These are usually skin and intestinal bugs that make their
way through the urethral opening, guys like
coagulase-negative staph, Corynebacterium, enterics, and
anaerobes such as Bacteroides and Propionibacterium.  So
urine that has been passed would be expected to have fairly
low numbers (less than 10,000 CFU/ml) of these bugs.  The
original question then becomes are Nitrobacter and
Nitrosomonas included among those.  To that I can't really
speak intelligently, but I would be very surprised if they were
"normal" flora since they seem to me to be more dirt and
water bugs.  Perhaps transient flora once in a blue moon.

Alan D. Junkins, Ph.D.
Assoc Prof, Medical Laboratory Sciences
Medical University of South Carolina
junkinsa at musc.edu
http://www.musc.edu/mls/



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