Those studying the disease needed to know where wild birds were migrating and whether they carried the virus from its incubation points in large duck and chicken farms.
要回答这些问题不仅需要弄清野生鸟类的迁徙途径，还需要弄清它们是否携带了潜伏在大型养殖场中的病毒。
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Reovirus disease in muscovy duck was one poisonous infection by reovirus, and had caused heavy losses in muscovy duck industry since it happened in our country.
Proper agronomic practices, duck raising in the paddy field and application of phyto pesticides prove to be effective in controlling pest, disease and weeds in the production of organic rice.