Translations:Basic Field Epi: Manual/639/en

Revisi per 25 Agustus 2014 03.48 oleh FuzzyBot (bicara | kontrib) (Importing a new version from external source)
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  • Introduction of the disease into the farm by newly bought chickens
  • Wild birds
  • No vaccination
  • Young age of chickens
  • Crowding (high population density)
  • Visitors with dirty clothes (contaminated with the infectious agent)
  • Contaminated food or water