Ehrlichia is in the family anaplasmataceae.
They are part of the Proteobacteria phylum.
It is a gram negative bacteria which is a bit more difficult to treat.
The Ehrlichia as of 2014 was known to have seven species.
Treatment: Ehrlichial and anaplasmal bacteria are resistant to most antibiotis:aminoglycosides(gentamicin),fluoproquinolones(cipro), beta-lactams(penicillins), macrolides and ketolides (erythromycin and telithromycin), and sulfa containing drugs(co-trimoxazole).
They do respond well to tetracyclines, especially doxycycline. If doxy cant be used, rifampin is an effective alternative.
So all of the above was taken fro Stephen Buhner's co infection book. He goes into even greater depth of this infection in the book.
Please do you own dilligence and I highly recommend hi books for gaining and insight as to how these infections function in the human body.
I have always strongly suspected I was infected with one of the Erlichias. From what I read Missouri is basically the epicenter for Erlichia. I also believe twitching to be an Erlichia symptom. Twitching was a big one for me.
Jo's list of abx above did not include the cephalosporins, which work(ed) wonders for me. Not sure what the science says or if there have been clinical trials of Erlichia being treated with cephalosporins. I'm not even sure they prescribe Cephalosporins to kids.
I did respond well to other abx as well.
Your child is lucky to have you for a parent as you are keen to consider proper early treatment instead of most pediatrician's "wait-and see" approach.