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==Signalment==  
 
==Signalment==  
* Most prevalent  in the UK and western Europe.
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Grass sickness has been reported in Northwestern Europe and South America with the highest incidence in the UK, in some parts of Eastern Scotland 1% of horses die annualy from the disease.  
** Common in wetter areas, e.g. the South West.
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The disease usually occurs in spring or summer in horses at pasture or
* Seen in horses out at pasture in late summer and autumn.
   
* Usually affects young adults.
 
* Usually affects young adults.
 
** 6-7 years old.
 
** 6-7 years old.
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