Onychomychosis Growth

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Does anyone have any clinical figures on the rate of growth of onychomycosis? I have a patient who claims that both the great nails became discoloured immediately following cleaning up after the recent Queensland floods, January 2011. Half the nail (approx 8-10mm) became black, painful and separated from the nail bed with dry red/brown debris under the nail well within the week following the cleanup.

Although the patient claims no trauma occurred, I believe walking around in the mud in shoes would have caused increased pressure. This combined with the fact they are diabetic and are on Astrix tablets indicates more acute bruising to me rather than a rapid growing OM infection?

I am not disputing there might be a fungal infection now (the whole area was filthy and a nail scraping would be the next thing to do) but I doubt this was the case when first presented to me three weeks after the event.

 

Seems quick growth for common onychomycosis. May be an aspergillus infection.
http://ezinearticles.com/?Aspergillus-Nail-Infection&id=525819