Experimental Spirocercosis in Dogs with Larvae from a Paratenic Host, Calotes versicolor, the Common Garden Lizard in Madras

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Abstract
Large numbers (88.5%) of the garden lizard, Calotes versicolor, near Madras, India, harbor encapsulated larvae 1.73 to 2.65 mm long and presumed to be those of Splrocerca lupi. When the encapsulated or free larvae were fed to 3 pups under 1 month old, infection was successfully established. Juvenile S. lupi recovered from nodules in the pups had grown to a size of 7.45 mm in 28 days and were still in the aorta; to 2.7 cm in 78 days, also confined to the adventltia of the aorta; and to 3.6 cm in 109 days, when most of them had migrated to the esophageal wall, with the aorta showing the characteristic pouching and aneurysm. Dogs may acquire natural infections by eating these lizards. Identical larvae were detected once in the stomach wall of a grey shrew, Suncus murinus.

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