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Old 09-11-2013, 08:27 PM
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MollyD MollyD is offline
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Join Date: Feb 2012
Location: Ole Miss
Posts: 10

It actually does cause/spread resistance. Look at it this way, the slow-kill method kills the babies but not the adults, right? The adults can live for several years inside a dog before they die. So let's say the adults have 100 babies and the preventative kills all except 2 that happen to be resistant to the ivermectin. Those 2 babies grow up to be adults and have more resistance babies. Not to mention that dog won't be heartworm free anytime soon. A mosquito bites that dog, picks up the heartworm larvae, and spreads it to another dog. Bam, more resistant heartworms.

If you do the regular treatment with Immiticide, ALL of the heartworms die and don't have a chance to create any super babies.

The only drug that seems to be 100% effective is Moxidectin which is found in Advantage Multi and Proheart 6.

If you can't already tell, I've been thinking about this a lot lately! I'm trying to decide what to do about my dog since I do live in this high risk area.

More interesting articles:

Edited to add: It's similar to the problem we're having with antibiotic resistant strains of bacteria.
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