Giardia: A Parasite of Many Species

If you have a friend who camps or fishes, you may have heard that they had been infected with Giardia. Or your veterinarian may have told you that your cat or dog had Giardia. In either case, you probably wondered, can I catch it as well?

Giardia is a protozoan parasite (one-celled organism) that can infect a variety of species, including pets and people. The human form of Giardia really likes people, the canine form likes dogs, the feline form likes cats, and the ruminant form likes cows and sheep. But it is possible for any of the forms to infect any of the other species.

In an animal or a person, Giardia lives in the intestinal tract. It may cause no symptoms, especially at first, but with time and as the organism becomes more numerous as it propagates, diarrhea commonly occurs. Some people may have more long standing or severe disease; then the symptoms can also include abdominal cramping, nausea, vomiting, loss of appetite, and weight loss. Pets also get diarrhea when infected, but they tend to get diagnosed faster as it is common to do regular fecal testing in veterinary medicine.

Giardia cysts are passed in the feces of infected animals and people. These cysts are resistant to environmental extremes, and thus can live in feces or fecal contaminated soil, surfaces, and especially water, for a long time.

Pets and people are usually exposed from contaminated sources in the environment. Giardia is a common cause of recreational water illness, from pools, water parks, water play areas, hot tubs, lakes, rivers, ponds, streams, and oceans. Pets and people swallowing even a small amount of water can become infected. You share the water, and the germs in it, with every person or animal who enters that water. The infective Giardia cysts can also be present on other surfaces contaminated with feces such as bathroom fixtures, changing tables, diaper pails, and toys. Uncooked, fresh produce can be contaminated as well.

Luckily, Giardia is easily diagnosed in veterinary medicine. There are two tests commonly performed: a microscope test call an "ova and parasite" (O&P) where the technician looks for the presence of the parasite in a solution made from the feces and then centrifuged. The other test also uses a stool sample, but uses a more sophisticated method to check for any DNA of the Giardia parasite.

Treatment is usually very rewarding. Drugs commonly used are metronidazole or fenbendazole, although in stubborn cases they may be used at the same time.

What can you do to prevent infection in the first place? Have your pets' stool checked regularly for parasites (at least twice yearly). Practice strict hygiene, cleaning surfaces that could become contaminated by stool. Wash your hands after going to the bathroom, and insist your children do as well. Every day, place any dog and cat feces from your property into plastic bags that will go to a landfill. If you have a pool, keep it well maintained, don't allow any person or pet in the pool if they have diarrhea, and have everyone shower (with soap) before entering the pool. Don't allow children to defecate while in the pool. Don't swallow any water when you are in a pool or any other type of recreational water. Wash all produce well before consuming.

Giardia is a common parasite. Your veterinarian can check your pets for Giardia by performing a stool test, and treat if necessary. You can prevent your family from being infected by some common sense, good hygiene practices.

Sources:

Companion Animal Parasite Council
Centers for Disease Control and Prevention

Location

Find us on the map

Office Hours

Monday:

8 a.m.-5 p.m.

Tuesday:

8 a.m.-5 p.m.

Wednesday:

8 a.m.-5 p.m.

Thursday:

8 a.m.-5 p.m.

Friday:

8 a.m.-5 p.m.

Saturday:

Closed

Sunday:

Closed

Testimonials

Feedback from our clients

  • "Thank you so much for always being there for my pets. The Vets are amazing and the office staff is always friendly and compassionate. I am so thankful to have been able to have my animals treated by such a wonderful staff."
  • "My Chocolate Lab was attacked by 2 Pit Bulls and I didn't think He would survive. I got Him in the car, bleeding profusely, called Pacific Crest and Laura said "bring Him in". The poor dog had tubes in places I wouldn't dream of. His ears were torn in pieces and I had little hope for survival. Many more tales with both dogs and I would never think of going else where."
  • "Thank you for checking on my Baby love the staff very friendly Dr. Kelly is amazing too."
  • "Thank you for taking such good care of our Cleo!"
  • "I cannot say enough good things sbout the staff here. Took my 11 year old kitty in today for a severely infected abcess and they worked hard fixing him up. Everybody is so incredibly sweet and helpful! The price after treatment was very reasonable as well. Beautiful facility with the most caring and professional staff you'll ever encounter. My new vet clinic for all of my fur babies from now on"
  • "My kitties love Pacific Crest! We appreciate the TLC and especially the guidance when we've had to make end-of-life decisions for our pets. It's always tough but it helps when you have a vet who understands and loves cats as much as you do."
  • "Not only are they amazing with horses...they are awesome with your small, four legged friends. So caring and compassionate. I wouldn't take my pets anywhere else!"
    Tammy