Is It Just a Stomach Upset? The Hidden Danger of Isospora canis

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What Is Isospora canis?

​It is a parasitic protozoon, which infects the intestines of dogs. These single-cell microorganisms are not the worms and cause a condition referred to as coccidiosis. The disease is asymptomatic for adult dogs but dangerous and possibly deadly for puppies whose immune system is still in development

Isospora canis oocysts in puppies - VetInsight Pakistan
Isospora Canis||vetinsight pk



​

​Classification & Morphology

​Target Site:

 Small Intestine (specifically the epithelial cells).

Morphology: 

Isospora oocysts have either ellipsoidal or ovoid shape. In their mature (sporulated) state, each individual oocyst has two sporocysts, each containing four sporozoites.

​2. Life Cycle of Isospora Canis

​Life cycle of Isospora canis is mainly direct; however, paratenic hosts may be involved (for example, rats):

​Ingestion: 

Dog ingests sporulated oocysts (which are infective) with its food or water.

​Excystation: 

After being ingested, the sporozoites hatch out of the oocysts and invade the small intestinal epithelial cells.

​Schizogony (Asexual Stage): 

Parasites multiply rapidly within the cells, rupturing them, and causing considerable damage to the lining of the intestine.

​Gametogony (Sexual Stage): 

There is development of microgametes (males) and macrogametes (females). Fusion of these gametes produces a zygote, which subsequently becomes an oocyst.

​Excretion: 

Unsporulated and hence non-infective oocysts are shed out with the feces. Oocysts need around 12 to 48 hours outside the host body to sporulate.
Life cycle of Isospora Canis||vetinsight pk


​The Ways a Puppy Can Be Infected

​The fecal-oral transmission is responsible for the spread of the condition. A puppy gets infected by consuming "oocysts" (eggs of the parasites) from contaminated water, soil, or objects.

​Stress Factors: 

It usually takes place in stressful conditions such as dog shelter, store, or in a recently bought pet.

​Immune System: 

Puppies younger than 6 months are the most vulnerable because their digestive system does not provide adequate immunity.

​Clinical Symptoms to Pay Attention To

​Here are the signs you should never neglect:

​Diarrhea: 

It is watery and may be associated with presence of mucus or even traces of blood.

​Dehydration:

The result of massive liquid loss.

​Emaciation:

Due to the malabsorption syndrome, it causes a pot-bellied appearance and general weakness.

​Vomiting and lethargy: 

When the infection becomes secondary.

Diagnostic Procedure and Veterinary Treatment

The diagnosis is made by conducting a Fecal Flotation test in a microscopic slide. At the veterinary hospital, we identify oocysts that have an oval shape.

Protocol of the Treatment:

Medication: 

The first option to get rid of the parasitic disease is Sulfadimethoxine (Albon). This medicine prevents any reproduction in parasites. Ponazuril can also provide efficient results.

Supportive Therapy:

Fluid therapy might be needed in case of severe dehydration.

Hygiene: 

Most disinfectants do not help to clean up coccidia oocysts. It is vital to steam-clean all contaminated areas or apply bleach-based cleaning products.

Bottom Line

Coccidiosis is a curable parasitic infection. If you notice loose stool in your puppy, do not hesitate to visit a veterinarian immediately.

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