"An organism that has complex nutritional requirements"
ref: http://www.biology-online.org/dictionary/Fastidious_organism
Here is an open access paper using this term:
Degnan AJ, Sonzogni WC & Standridge JH (2003) Development of a Plating Medium for Selection of Helicobacter pylori from Water Samples. Appl. Environ. Microbiol. 69(5): 2914-2918
http://aem.asm.org/cgi/reprint/69/5/2914
Though I don't study human pathogens, I do work with organisms that are difficult to isolate from their more persistent "weedy" companions. The following quote from this paper seemed to sum up the challenge particularly well:
developing an acceptable selective medium for H. pylori in water presented the classical microbiological problem of finding a medium that is nutritionally rich enough to resuscitate and grow a fastidious organism while managing to inhibit the growth of all the other organisms found in water samples.
This sentence really sums up the focus of my quest for this week!
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