There's some exciting new research being undertaken by Dr Martin Nielsen a leading parasitologist at the University of Kentucky. This project involves a possible new method of equine parasite control using naturally occurring bacteria. You can sign up for more information via the attached link. There's also a Q&A section where you can post questions which Dr Nielsen answers personally.
at http://equineparasitology.ca.uky.edu/.
at http://equineparasitology.ca.uky.edu/.