What do you mean by filaria births , I never heard of such a thing . The article I posted is about encysted L3 infective fertile female larvae . After killing all the egg laying adults , you are left with encysted larvae that will rebuild the colony if given the opportunity . Only 2 meds are documented to deal with encysted larvae moxi and Fenben . http://thehorsesback.com/encysted-small-strongyles/