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Vaccines already exist for swine and chicken coronaviruses. But it isn’t easy to gauge whether SARS，or any virus.can trigger an epidemic. “We’ve been working with influenza for over 50 years and it can sti1l evade our best attempts.” “In many cases of the influenza virus we don’t understand the molecular properties that cause high mortality，”said Nancy Cox， chief of the influenza branch at the CDC. “Outbreaks are like wildfires，”Morse said.“Some fires smolder and are easily extinguished.Others rage out of control，destroying everything in their path.The WHO and the CDC are like the fire department and they need to investigate all outbreaks because you never know which way they could go.” Morse points out our long history with influenza.SARS is only a few months old. Tracking and containing viruses，and predicting what they will do，Morse said，“It is as much an evolving science as an evolving art.” 2.Fight Continues Against HIV/AIDS A picture，a calendar or even a balloon may be the best way for millions of people living in China’s vast country areas to learn about AIDS，one of the biggest threats to public health in the world today. China has decided to use user—friendly methods including exhibitions, VCDs and TV programmes to spread knowledge of the disease across the nation to try to keep it in check. Educating people nationwide about AIDS is the top priority(优先权)to prevent the disease from getting out of hand.The farmers wil1 be given knowledge in the easiest way that they can understand. A recent survey from the commission(调查团)of more than 7 OOO people in China showed that nearly 20 percent of them had never heard of AIDS before.Just over 71 percent said they knew AIDS was highly infectious(传染的),but most of them had no clear idea of how the disease could be spread.Just over 62 percent said they knew they could do things in advance to prevent them catching AIDS but they didn’t know what these measures were. The month—long survey，carried out last December，talked to people in seven counties and cities across China including both developed coastal areas and the less—developed in—land areas.The interviewees changed from 15 to 49 years old，and country residents were about 63% of the total surveyed. (责任编辑：admin) |