Features
September 2011 Issue
Don’t stop using those heartworm preventives in the face of resistant strains; that’s the time to step it up!
Heartworm Resistance Update September 2011
There’s more than one resistant heartworm isolate.
In “Time to Step It Up” (WDJ July 2011), we described one small study that showed only Advantage Multi was 100 percent effective against the MP3 strain of resistant heartworms after a single dose. The report was true as far as it went, but new points have emerged that make this a more complex story and one for which we do not have all the answers yet.
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