结论SARS病毒具有传染性极高、传播速度极快等特点，传播因素最大的可能是飞沫。

Conclusions the SARS virus had the characters of high infectivity and high transmitting speed. The SARS virus was most likely spread by droplet transmission.

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牛在血吸虫病的传播因素中又比较重要，高的牛的患病率必定对疾病的控制是一个很大的威胁。

The buffalo plays a comparatively important role in the spreading factor of schistosomiasis, and the high morbidity rate of buffalo is a big threat to disease control.

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方法采用回顾性调查研究方法计算麻疹疫苗(MV)效力(VE)，采用病例对照研究进行传播因素分析。

Methods Reviewing investigation was used for the MV coverage rate and immunization efficacy (ve), a case control study was carried for seeking risk factors.

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