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Originally Posted by gidget529  Hope these aren't dumb questions but:
1. Is this from product failure? Or new strain identified?
2. Is this just occurring in the South or do also see in North?  |
There has been a huge increase in reports of products failing and the assumption is that this new strain could be partly to blame (older products just don't do well with it). I haven't read anything that would indicate that the older products are becoming much less effective for the older strain(s) of heartworm.
I'd be much less concerned in the North right now. This is in the Mississippi Delta area and possibly some others. Research is ongoing to figure everything out. As far as I know, here in MI there haven't been a big increase in lack of efficacy claims. Apparently one of the vet's offices here hadn't even heard about it.