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==Signalment==
==Signalment==
Foals younger than 6 months in poor condition, on a poor worming schedule and with a heavy parasite burden. Adult horses demonstrate age-related immunity from around 15 months.
Foals younger than 6 months in poor condition, on a poor worming schedule and with a heavy parasite burden. Adult horses demonstrate age-related immunity from around 15 months.
==History==
==History==
Recent history of being wormed with a product that causes sudden ascarid death.
Recent history (within the previous 24 hours) of being wormed with a product that causes sudden ascarid death.
==Aetiology==
==Aetiology==