What is coccidiosis?
Coccidiosis is an infection with a one-celled organism; these organisms are
classified as protozoa and are called coccidia. Coccidia are not worms; they
are microscopic parasites which live within cells of the intestinal lining.
Because they live in the intestinal tract they can be associated with diarrhea
problems especially in puppies. These should not be confused with worms. Diarrhea
due to coccidiosis is occasionally a problem in Britain but the coccidia are
usually associated with another causal organism.
How did my dog become infected with coccidia?
Oocysts (immature coccidia) are passed in the feces of the dog. They remain
in the environment and eventually sporulate (mature) into a more developed oocyst
which can infect the dog again. Other dogs, cats, or mice may also become infected.
This process can occur in as little as 6 hours, but it usually takes 7-10 days.
If the sporulated oocysts are swallowed, they mature in the dog's intestine
to complete the life cycle. If the oocysts should be swallowed by a mouse, the
dog may also become infected by eating the mouse.
What kinds of problems are caused by coccidial infection?
Most dogs that are infected with coccidia do not have diarrhea or any other
clinical signs. When the eggs (oocysts) are found in the feces of a dog without
diarrhea, they are generally considered a transient, insignificant finding.
However, in puppies and debilitated adult dogs, they may cause severe, watery
diarrhea, dehydration, abdominal distress, and vomiting. In severe cases, death
How is coccidial infection diagnosed?
Coccidiosis is diagnosed by performing a microscopic examination of a feces
sample. Since the oocysts are much smaller than the eggs of the intestinal worms,
a very careful study must be made. Infection with some of the less common coccidial
parasites is diagnosed with a blood test.
How is the coccidial infection treated?
The most common drug used to eliminate coccidia is a sulfonamide antimicrobial
drug. It is given for 10-14 days. Other drugs are also used if diarrhea and
dehydration occur. If the sulpha type drug is not effective, others are available.
Reinfection of dogs is common so environmental disinfection is important. The
use of chlorine bleach, one cup in a gallon of water (500 ml in 4 liters), is
effective if the surfaces and premises can be safely treated with it.
Are the coccidial parasites of my dog infectious to humans?
The most common coccidia found in dogs do not have any affect on humans. However,
less common types of coccidia are potentially infectious to humans. Coccidial
parasites pose a health risk for immuno-suppressed humans (i.e., AIDS patients,
those taking immune suppressing drugs, cancer patients, the elderly). Good hygiene
and proper disposal of dog feces are important in minimizing risk of transmission
of all canine parasites to humans. Although there is risk of the dog transmitting
parasites to humans it does not warrant removing the dog from the household
except in very rare circumstances.
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