Hi Shauna,
I was simplifying things for the benefit of the non micro people.
We would also report Pm starting at 10 colonies but was thinking that in the context of supposed RA subclinical UTI that 1 colony Pm might be significant.
But we and you would just disregard that with "No significant growth" which conveniently for us could mean just about anything. Probably we avoid "Mixed growth" for reason you gave.
I often think that in some ways lack of Klebs in faeces when on NSD doesn't mean that much. Wouldn't expect to find Klebs in anyone on NSD! That doesn't exclude the probability that some component of the gut flora is being negatively effected by NSD, or even that something peculiar to starch itself is causing dimunition of symptoms.
The "arthritogenic peptide" molecular mimicry theory has gone in and out of fashion over the years. Currently the Klebsiella theory is NOT popular amongst the current researchers.

Regards David

Dx Oct 2006 B27+ undifferentiated spondlyarthropathy (uSpA) with mild sebhorrhoeic dermatitis and mild Inflammatory Bowel Disease (IBD) controlled by NSD since 2007.