http://healthypets.mercola.com/sites/healthypets/archive/2011/06/16/this-mosquito-borne-superworm-is-soaring-in-the-us.aspx
I thought this article was VERY interesting, especially if you live in
the south central US. They have identified a genetic variation in some
heartworms that makes them resistant to the pesticides currently used to kill
them.
The article is from a holistic vet, and as many of you know I do
take a complete holistic approach with Audrey. I live in NC, in one of the red
zones on the heartworm incidence map, and Audrey is heartworm negative. I am not
trying to tell anyone what to do with their dogs, just saying that it IS
possible to be successfully heartworm free without the pesticides.
However, the holistic vet in the article is NOT ADVOCATING stopping
chemical heartworm preventatives! She does offer some good advice for helping
keep your dog heartworm free as safely as possible.
here is an article
from DVM. They basically say, "yes there are resistant heartworms but use the
current protocal anyways." Not real helpful.
http://veterinarynews.dvm360.com/dvm/Parasitology+Center/Heartworm-resistance-CAPC-AHS-issue-new-guidelines/ArticleStandard/Article/detail/697201
Cathy and Audrey