探討 麻疹疫苗 全球流動人口 疾病傳播風險 焦點議題
U.S. health officials have changed their advice to international travelers about measles, saying Americans should be vaccinated against the disease no matter where they travel in the world.
U.S. health officials have changed their advice to international travelers about measles, saying Americans should be vaccinated against the disease no matter where they travel in the world.