LARVAL CYATHOSTOMIASIS AS A CAUSE OF DEATH IN 2 REGULARLY DEWORMED HORSES

Two horses were presented with complaints of chronic weight loss and s ubcutaneous oedema, one of them presenting diarrhoea. Both animals wer e grazed with other unaffected horses, all of them being regularly dew ormed. Blood chemistry revealed hypoalbuminaemia and a low albumin-glo bulin ratio. Faecal egg counts were negative and no cyathostome larvae could be found in the faeces. Neither of these horses could be saved, despite intensive treatment. Post-mortem examination revealed severe typhlitis and colitis due to numerous inhibited cyathostome larvae.