By doing the Blood Test you get the count in the titers, don't know how to explain this other than a comparison, so here goes, you know how in humans we have blood sugar levels, and there is a test for the levels for sugar, there is a normal range, a low and a high, so hypo and hyper, if the birds test in the normal range they are deemed not to have it, they still have it, its just not considered positive until it reaches a certain level, hope that made sense, the teters tell the count. You won't get those results from the Swab test to truly know for sure where exactly the birds stand. Not sure what Genome is, I'd have to look that up, possibly meaning the type of Mycoplasma is my guess on the word genome. I do blood tests more for accuracy and also if there is another disease in question, it can also be checked from the blood draw submitted.
There are some free tests you could do too, there is a T12 test thru Purdue University for eggs, you send eggs, pay the postage for the eggs to Purdue and they test for 4 diseases, Mycoplasma is one of the 4, I have that information stored on my computer somewhere as well as the phone number for Purdue.
Victoria