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All Posts Tagged: Giardia

PODCAST: Giardia … cha cha cha …

Diarrhea has a number of causes, but one that we’ve seen quite a bit in our patients recently is Giardia, a parasite that is transmitted in stool (Giardia can be transmitted to humans in this way, but people most often get this parasite from contaminated water). Once a pet is infected, it will typically take 5-12 days in dogs and 5-16 days in cats for the parasite to be found in the stool — however, diarrhea can occur before the parasite actually shows up in the stool.

To diagnose Giardia, your veterinarian will need a fresh stool sample from your pet. As this parasite cannot be detected by the naked eye, the doctor will examine the sample under a microscope. Sometimes the test may need to be repeated, as this parasite can shed intermittently — so while an initial test may come up negative, further tests may come up positive. A newer variety of test is the “snap test,” which tests for Giardia proteins in the stool. The snap test does help improve diagnosis; however, while almost all veterinarians have the capability to look at a stool sample under the microscope, the snap test is less readily available, and not all veterinarians will be able to offer it.

© 2011 Greenbrier Emergency Animal Hospital. All rights reserved.

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Giardia…cha cha cha…

Diarrhea has a number of causes, but one that we saw quite a bit in our patients this summer is Giardia, a parasite that is transmitted in stool (Giardia can be transmitted to humans in this way, but people most often get this parasite from contaminated water). Once a pet is infected, it will typically take 5-12 days in dogs and 5-16 days in cats for the parasite to be found in the stool — however, diarrhea can occur before the parasite actually shows up in the stool.

To diagnose Giardia, your veterinarian will need a fresh stool sample from your pet. As this parasite cannot be detected by the naked eye, the doctor will examine the sample under a microscope. Sometimes the test may need to be repeated, as this parasite can shed intermittently — so while an initial test may come up negative, further tests may come up positive. A newer variety of test is the “snap test,” which tests for Giardia proteins in the stool. The snap test does help improve diagnosis; however, while almost all veterinarians have the capability to look at a stool sample under the microscope, the snap test is less readily available, and not all veterinarians will be able to offer it.

Treatment for Giardia involves multiple aspects of your pet’s life. Oral dewormers are given, as with many intestinal parasites. But with Giardia, bathing and hygiene are just as important as medication. This parasite can stick to your pet’s fur, and when the animal licks itself, he or she can be reinfected. You will also need to dispose of all stool immediately, and clean bedding and flooring regularly. Diluted bleach will kill this parasite on floors and in the laundry — however, killing Giardia on surfaces like grass is far more difficult, since it would require killing the plant life as well.

Other preventative measures include wearing gloves when handling stool and always washing your hands after handling stool or playing with your pet. There is a Giardia vaccine available, but this particular vaccine does not prevent infection. Instead it reduces the amount of the parasite shed in the stool, thereby reducing the amount of environmental contamination. This treatment doesn’t usually help animals that have already contracted the parasite, but it may be helpful in kennel situations and with pets that keep getting reinfected.

If your pet has diarrhea, please give your primary care veterinarian or Greenbrier Emergency Animal Hospital a call as soon as possible. We can help diagnose the cause and get your pet the treatment that he or she needs.

© 2010 Greenbrier Emergency Animal Hospital. All rights reserved.

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What’s in the pond water? Water-borne parasites

Ever worry about what your pet could be contracting when he/she stops and drinks out of a pond or other stagnant body of water? Many water-borne parasites can cause clinical signs that are anywhere from mild to severe. The most common parasites include, but are not limited to:

Giardia: Giardia is a protozoan that can live for a long time in stagnant water. It causes diarrhea, which is often watery but not bloody. It can be hard to detect on a regular fecal float at your vet, and often further testing is required. It is shed intermittently in the feces, making detection that much harder. The most common treatments are fenbendazole and metronidazole. There is a vaccine for giardia that does not prevent the infection, but does prevent shedding of the protozoan — making it useful in kennel-type situations. Is it transmittable to humans? Yes, humans can be affected by drinking contaminated water.

Coccidia: Coccidia is a single-celled organism that is transmitted by the fecal-oral route, meaning that it is passed in the stool of the host and ingested by another host. The most common form of Coccidia Isospora is species-specific and therefore is not cross-transmitted. Coccidia causes watery, voluminous diarrhea, with or without blood. It is easily passed to young animals with weaker immune systems but rarely affects adults. It is usually detected on a fecal flotation, but a very small amount of Coccidia can cause an infection, so it can be missed on a fecal flotation. Coccidia is commonly treated with Albon or sulfa drugs. Can it be passed to humans? The most common form is species-specific, but humans can contract the Coccidia toxoplasma from cats, which can be a risk for pregnant women.

Leptospira: Leptospira is a spirochete bacteria that affects dogs and rarely cats. It thrives in warm, stagnant water such as a marsh or muddy area and is usually shed in the urine of wildlife or rodents. It initially causes a fever; then the fever subsides, and the clinical signs progress to liver damage and kidney failure. Leptospira can be detected by a blood test. Many dogs are vaccinated for Lepto as part of their annual checkup. The vaccine is specific for certain serovars or strains of Lepto, so it is still possible to contract Lepto after being vaccinated. The treatment for Leptospira is supportive care and antibiotics, but the prognosis is poor.

Campylobacter: Campylobacter is a bacteria often found in water contaminated with feces. It mostly affects puppies less than 6 months of age, and rarely affects cats. It is often isolated from the GI tract of normal adult dogs, but can overwhelm the system in puppies, causing a high fever and watery, mucoid or bloody diarrhea. The diagnosis is made on a fecal wet mount. Animals that are positive for campylobacter and have an associated high fever are treated with antibiotics.

Cryptosporidia: Cryptosporidia is a protozoa affecting both cats and puppies usually less than 6 months old. It is usually found in water contaminated with feces. It causes watery diarrhea, weight loss, bloating, gas and nausea. It is hard to detect on routine fecal flotation, and usually is detected by sending a fecal out to a lab that uses special flotation solution. The clinical signs are usually self-limiting and rarely require treatment other than a bland diet for three days. If the diarrhea is severe, occasionally IV fluids and supportive care are required.

The majority of the water-borne parasites cause diarrhea, which is treatable in a healthy animals. An immuno-compromised or otherwise debilitated animal might have more severe clinical signs. Among water-borne parasites, Leptosporidia carries the poorest prognosis if it advances to liver and or kidney failure. The best prevention is to make sure your dog is vaccinated, to carry fresh water for your dog, and to try to discourage them from drinking from stagnant water.

© 2010 Greenbrier Emergency Animal Hospital. All rights reserved.

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