So far, most bird flu cases in people, have been caused through contact with infected poultry, but scientists are concernd the virus could mutate into a for m more easily spread between humans cause a pandemic.

• 至今，大多数人群中的禽流感，是通过与感染的家禽接触而引起的，但是科学家们担心，病毒可能会变异成一种在人类中更容易传播的形式从而引发全国性的流行病。