OBJECTIVES The oocysts of the Toxoplasmatinae subfamily (<i>Neospora caninum, Hammondia hammondi</i> and <i>H. heydorni</i>, and <i>Besnoitia besnoiti</i>) are morphologically similar to <i>Toxoplasma gondii</i>, and indistinguishable from each other. This study investigated the prevalence of the Toxoplasmatinae subfamily in dog and cat fecal samples using a nested polymerase chain reaction method.
METHODS
Overall, 200 fecal samples from domestic dogs (n=120) and cats (n=80) were collected from 15 farms in northern Iran. The samples were homogenized in 2.5% potassium dichromate solution and subsequently concentrated with sucrose solution. DNA was extracted from samples using a genomic DNA kit. Specific primers and the 18S rDNA gene were used to screen and detect all Toxoplasmatinae oocysts.
RESULTS
Overall, 2.5% (3 of 120) and 22.5% (18 of 80) of the fecal samples collected from dogs and cats were infected with Toxoplasmatinae. In dogs, 2 samples were positive for <i>N. caninum</i> and 1 sample was positive for <i>T. gondii</i>. In cats, all 18 positive samples belonged to <i>T. gondii</i>. No contamination with <i>H. heydorni</i> was observed in dog fecal samples or <i>H. hammondi</i> and <i>B. besnoiti</i> in cat fecal samples. A phylogenetic analysis revealed that the <i>T. gondii</i> (cat) and <i>N. caninum</i> (dog) found had similarities with parasites reported from other regions of the world.
CONCLUSIONS
This is the first study to provide data on the epidemiology of Toxoplasmatinae oocysts in Iran. The findings suggest that public-health monitoring for the effective control of feces from cats and dogs and improved pet hygiene habits are needed.
Summary
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