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Ask Dr. Michael Salkin Your Own Question
Dr. Michael Salkin
Dr. Michael Salkin, Veterinarian
Category: Dog Veterinary
Satisfied Customers: 30326
Experience:  University of California at Davis graduate veterinarian with 45 years of experience
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Wanted to update you. My dogs microfiliaria test came back

Customer Question

Hi wanted to update you. My dogs microfiliaria test came back negative they didn't see any worms. I am not sure what there plan is trying to figure it out. They are saying go ahead and give the prevention med and retest in 6 months. But waiting for a plan.
I'm confused about all this especially since he tested borderline positive.
Submitted: 1 year ago.
Category: Dog Veterinary
Expert:  Dr. Michael Salkin replied 1 year ago.

There are instances when an infected dog will be negative for microfiliaria; in fact, an infected dog can be negative for both microfiliaria and adult heartworms if only male heartworms are present. Unless Koda had been treated previously and the HW antigen still remained in his blood but no adult heartworms are present, his "borderline positive" is a positive and I believe that he should be treated. As the recommendations stated, however, "All positive antigen tests in asymptomatic dogs should be confirmed prior to any adulticide therapy; concentration tests for microfilariae, thoracic radiography, or ultrasonographic visualization of worms may also help validate weakly positive antigen test results. Retesting and having the test performed by our reference laboratory rather than in house would be prudent.

Expert:  Dr. Michael Salkin replied 1 year ago.
I'm just following up on our conversation about Koda. How is everything going?
Dr. Michael Salkin