A good thread never dies.....
And now to come at it from an interesting public health question.
This article from CNN explains a bit how Ivermectin us used against Onchocerca in Africa to combat river blindness - horse owners will recognize the symptoms! What struck me in this and other articles, is there is no mention of concomitantly treating livestock and yet the disease has been eliminated in several countries. So the humans are suceptible only to Onchocerca volvulus, and the horses to Onchocerca cervicalis? Since so many of our horses seem to have it but no one talks about being diagnosed themselves, that is the transmission break between people and horses? And the same black midge fly that bites me when I go feed the pony is the vector of both?
Are there any signs of an Oncho elimination push in livestock (Ivermectin 2x per year)? or is that not feasible since it isn't approved for use in food animals so that cattle would remain as a reservoir?