Some scientists think SARS, too, will prove to be a seasonal disease.

一些科学家认为，非典也将成为季节性疾病。

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Conclusion HFMD mainly appears in 1-3-year-old scattered children, more male than female, and more in rural area than in urban area. It is a seasonal disease.

结论手足口病发病以1 - 3岁散居儿童为主，男性多于女性，农村多于城市，疾病发生有明显的季节性。

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WHO also sought data on the clinical spectrum and patterns of the disease and how this compares with what is seen during epidemics of seasonal influenza.

世卫组织还征集了关于该病临床范围和规律以及与季节性流感流行期所见情况进行比较的数据。

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Since January, more than 13, 000 people have died of complications from seasonal flu, according to the Centers for Disease Control and Prevention's weekly report on the causes of death in the nation.

CNN: Regular flu has killed thousands since January

He told BBC News Online that the concept of seasonal variation in the risk of Crohn's disease had been studied on many occasions since the mid 1960s.

BBC: Seasonal variation in Crohn's risk

Small studies in ferrets at the CDC suggest that when compared with seasonal flu, the virus appears to cause more severe disease but also seems to spread less easily.

CNN: CDC: U.S. may need 600 million swine flu vaccine doses