CLEAN : Shanghai Peoples government conference

The video discusses the sudden onset of flu season and poses a question to engage the audience. It explains the effects of droplets in transmission and describes the characteristics of the H7N9 flu. Observations of current cases show no human-to-human transmission. Concerns about the virus spreading internationally are addressed, emphasizing that human transmission is necessary for such spread.

您认为公众对流感传播的担心是否合理？请说明理由。

为什么人传人是病毒扩散的前提条件？