Experts say strains of the virus can be transmitted globally by migratory birds. China is on the migratory path of virus carriers and at great risk of infections.
专家表示H7N 9病株可能由全球候鸟携带，而中国是携带病株候鸟迁徙的必经之路，这大大增加了中国感染病毒的风险。
Experts say strains of the virus can be transmitted globally by migratory birds. China is on the migratory path of virus carriers and at great risk of infections.
专家表示H7N 9病株可能由全球候鸟携带，而中国是携带病株候鸟迁徙的必经之路，这大大增加了中国感染病毒的风险。
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