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'''Overcrowding and movement''' of pigs between sites predisposes them to infection and clinical disease.  
 
'''Overcrowding and movement''' of pigs between sites predisposes them to infection and clinical disease.  
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Infection is most common in 8-14 week old piglets, particularly within 1-2 weeks of moving and mixing batches.
 
Infection is most common in 8-14 week old piglets, particularly within 1-2 weeks of moving and mixing batches.
  
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