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Many dogs become reinfected with giardia as soon as treatment is finished because their environment remains contaminated. Following are tips for preventing giardia reinfection in your dog:
It can be frustrating if a dog continues to test positive for giardia after treatment. The giardia ELISA test can remain positive for weeks to months following successful giardia treatment — so a positive test does not necessarily mean active infection. However, if giardia cysts are present in your dog’s fecal sample, active infection is present and you must redouble your efforts to limit your dog’s exposure to giardia and decontaminate your environment.
If additional treatments are unable to eliminate giardia infection in your dog, your vet may recommend a more extensive medical evaluation for your pet. Testing can also be performed to determine if the giardia infecting your dog is zoonotic — meaning an organism that can also sicken humans. The Centers for Disease Control (CDC) has detailed information available on giardia and how to prevent infection in people. The risk of infection is small because the type of giardia that affects humans is not usually the same one that affects dogs and cats, but it is good to be informed.
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