Vaccines are given to protect but it often fails in some puppies, dogs, cats and even people.
Tests for viruses and diseases can give false positives results.
Many times a dog/puppy will test positive for a disease (especially for in-house vet test kits) that the dog/puppy
has been vaccinated for, but hasn't actually have.
Sounds confusing doesn't it?
Say a young dog or puppy comes into a vet clinic with
diarrhea (especially if there's blood in the diarrhea), vomiting, loss of appetite and general sick, will be tested for parvo virus.
The puppy could have any number of diseases but it is not yet sure it is parvo. The test will consist of taking a swab of feces from the puppy's bottom and it is then run through a test kit to see if it contains parvo antigens (proteins or sugars on the surface of the virus that are specific to parvo viruses).
If the test comes out positive, it is said the pup has parvo. Correct?
Sometimes. False positives: If a pup has been vacinated with a live parvo vaccine 4-14 days before the parvo test was run, the dog/puppy will shed vaccine-associated parvovirus antigens into its feces and these will show a positive result
on the feces test.
Therefore, a dog/puppy that has been vaccinated and protected against parvo will appear to have been
infected with the disease.
Keep in mind that if one pup in a litter has been infected with the parvo virus, the entire litter would be infected also as
parvo is highly contagious.
For more information or to verify this information
check out the links below:
www.pet-informed-veterinary-advice-online.com/vaccination-failure.html
www.peteducation.com/article.cfm?c=2+2115&aid=966
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