Vaccines are given to protect but often fails in some puppies, dogs, cats and even people.
Tests for viruses and diseases can give false positive results. Many times a puppy/dog will test positive for a disease (especially for in-house vet test kits) that the puppy/dog has been vaccinated for, but hasn't actually have.
Confusing isn't it?
Let's say a young dog or puppy goes into a vet clinic with diarrhea (especially if there's blood in the diarrhea), vomiting, loss of appetite and generally sick, will be tested for parvo virus. The puppy could have any number of diseases but it is not yet sure if 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 that the pup has parvo. Right? Sometimes or maybe. False positives: If a pup has been vaccinated with a live parvo vaccine 4-14 days before the parvo test was run, the puppy/dog will shed the vaccine -associated parvovirus antigens into its feces and these will show a positive result on the feces test.
Therefore, a puppy/dog that has been vaccinated and protected against parvo will appear to have been infected with the disease.
In general, keep in mind that if one pup in a litter has been infected with the parvo virus, (while they were still together) the entire litter would be infected also as parvo is highly contagious.
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The materials offered on this website are intended of educational purposes only. Weepin Oaks Boxers does not provide veterinary services or guidance. Please contact your veterinian in reguarding the care of your animals.