Quin said...
DNAConnexions reported that I had baronella henselae, but I don't know how specific the PCR test is in distinguishing different strains.
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most PCR testing compares the highly variable 16s region of bacterial DNA with reference sequences in a registered database in order to identify bacteria
in general this method is said to be only able to identify reliably down to genus level - as below this the similarities between different species are to great to distinguish reliably.
a figure of approx. 60% accuracy / reliability in determining species correctly via this method is commonly used
its not clear what method DNA Connections actually uses to create its species specific results
in general they seem to be one of the labs that has less published validation data out there.
this is a problem with all private labs - as current legislation in most counties allows anyone to set up such a service - and bring a test to market direct to customers - with only minimal in house validation - which does not have to be published or validated by any 3rd party - and the rest is all marketing and polish.
these companies know that most punters do not know how to tell a good test from a poor one - and many people will often choose a test based on how many organisms it test for vs price - eg choose one that seems to test for most things the most cheaply. (i'm not saying that s what you did Quin)
so this promotes the launch of multi-pathogen multiplex tests marketed on value - and the detail of how the test actually performs for each species is then lost in the complexity of sensitivity and specificity for each species - which very few people/customers ever dig into.