摘要
连日高烧、发冷以及全身无力——这是流感的典型症状。流感病毒在每个世纪都会发生几次根本性变异，从而导致流感的全面爆发——如卫生专家所担心的，猪流感就有可能会重蹈覆辙。流感的历史可以追溯到医学诞生的初期，公元前412年，古希腊医师希波克拉底就首次描述过类似疾病。
A few days of fever, chills and generally feeling rotten： that＇s a typical case of the flu. But several times a century, flu viruses mutate so radically that they can trigger a pandemic--as health experts fear could happen with swine flu. Influenza may go all the way back to the dawn of medicine; a similar illness was first described by Hiooocrates, in Greece in 417 B.C.
