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The aim of this study was to describe the frequency of ovine specific antibodies to  Toxoplasma gondii ,  Neospora caninum  and  Sarcocystis  spp. and to estimate different transmission routes of these infections. One hundred and thirty Texel sheep and their 117 Texel lambs were included in the study. Serum samples were tested for antibodies to  T .  gondii ,  N .  caninum  and  Sarcocystis  spp. using IFAT.  Toxoplasma gondii  seroprevalence was 10.00% in sheep (IC 95% : 4.80–15.20%), being higher in adult sheep (≥12 year) than in younger sheep (OR 1.30; 95% CI, 1.10–1.50).  N .  caninum  and  Sarcocystis  spp. seroprevalences were 1.54% (IC 95% : 0.00–5.70) and 72.09% (IC 95% : 67.70–82.70), respectively, with no association between age and seropositivity in sheep ( P &gt;0.05).  T .  gondii  seroprevalence in lambs was 4.27% (IC 95% : 0.61–7.94). No association between  T .  gondii  serological status in sheep and their lambs was detected ( P  = 0.07). Two  T .  gondii  and  Sarcocystis  spp. seropositive lambs were euthanized and  T .  gondii  and  Sarcocystis  spp. DNA was detected by PCR in their tissues. In conclusion, the increase of  T .  gondii  seropositivity in relationship with sheep age and the lack of association between sheep-lamb serological status, suggest that horizontal infection is the main transmission route in this flock as reported before. Due to the low number of  N .  caninum -seropositive ewes no assumptions can be done about the impact of this parasite in this flock. According with previous reports, the main transmission route for  Sarcocystis  spp. in this species in the present study was horizontal.

acta parasitologica

Evaluation of frequency of antibodies against  Toxoplasma gondii , Neospora caninum  and  Sarcocystis  spp. and transmission routes in sheep from Humid Pampa, Argentina