The health officials say that B. microti is the most common strain on the East coast.
B. duncani is only supposed to exist on the West coast. Not true. I get positive results for B. duncani with the same frequency as positive results for B. microti. Serology tests exist for these two strains. I finally got Labcorp to find the right code; they now do the test for B. duncani. Labcorp and Quest are a little mixed up. The old name was B.WA1- the new name is B. duncani. Labcorp and Quest still call it B. WA1. If you order serology for B. duncani they have no idea what you are talking about.
Clongen has a "species" PCR test for Babesia. It includes around 15 known species but does not include B. duncani. For some reason this PCR has to be ordered separately. This can get a bit expensive. I have found many patients who have negative antibodies for both B. microti and B. duncani test positive on the Clongen Babesia "species" test. The theory that many otherwise unspecified strains of Babesia exist in Lyme patients is held up by this data.
On a separate note- we have not yet identified the parasites which are seen in many patient's blood. One organism has been described as tear dropped in shape and has a tumbling motion. It appears to respond to Malarone not Mepron! If Mepron doesn't work for parasite- Babesia like symptoms, it may be worthwhile switching to Malarone.
A positive response is easy to determine- the Herx can be quite dramatic.