Middle East respiratory syndrome coronavirus (MERS-CoV) infection causes a spectrum of respiratory illness, from asymptomatic to mild to fatal. MERS-CoV is transmitted sporadically from dromedary camels to humans and occasionally through human-to-human contact. Current epidemiologic evidence supports a major role in transmission for direct contact with live camels or humans with symptomatic MERS, but little evidence suggests the possibility of transmission from camel products or asymptomatic MERS cases. Because a proportion of case-patients do not report direct contact with camels or with persons who have symptomatic MERS, further research is needed to conclusively determine additional mechanisms of transmission, to inform public health practice, and to refine current precautionary recommendations.

中文翻译：

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中东呼吸综合征冠状病毒传播。

中东呼吸综合征冠状病毒（MERS-CoV）感染会引起一系列呼吸系统疾病，从无症状到轻度到致命。MERS-CoV偶尔从单峰骆驼传播给人类，有时会通过人与人之间的接触传播。当前的流行病学证据支持在与有症状MERS的活骆驼或人直接接触的传播中起主要作用，但很少有证据表明从骆驼产品或无症状MERS病例传播的可能性。由于一部分病例患者没有报告与骆驼或有症状性MERS的人直接接触，因此需要进一步研究以最终确定其他传播机制，为公共卫生实践提供信息，并完善当前的预防性建议。