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The frequency, distribution and impact of small ruminant Sarcocystis infection in the European Union is largely unknown; this study reports the prevalence of macroscopic Sarcocystis sp. cysts and associated carcass condemnation, in 6065 adult, cull, small ruminants from 145 farms in Spain. Macrocysts were detected in 12% of sheep from 60% flocks, and in none of the 345 goats examined. Most affected sheep had cysts in more than one body part and as a result, 79% of sheep carcasses with cysts were totally condemned. Consequently, it is estimated that Sarcocystis spp. infection could be costing the Spanish sheep industry € 20 million yr -1 . Three types of cysts were identified according to size, shape and location: narrow, filament-shaped measuring 2-10 × ≤1 mm, present striated muscles only, and two wider types measuring 2-20 × 2-6 mm, including oval-shaped oesophageal cysts and more elongated cysts in striated muscles. Narrow and wide macrocysts were found in the same sheep and are compatible with Sarcocystis gigantea and Sarcocystis medusiformis , respectively, as described in New Zealand in the 1970s. However, cyst size and morphology varies with age and location. Moreover, S. medusiformis has not been reported in Europe and species-specific diagnosis is necessary to ascertain the ethiology of macrocysts in this study.

Short communication. Sarcocystis infection: a major cause of carcass condemnation in adult sheep in Spain