The low rate of transmission to persons with casual contact suggests that aerosoltransmission via the respiratory tract is not efficient, if it occurs at all.
偶然接触者的低传播率表明，如果确实发生，经过呼吸道的空气传播是无效的。
2
This recent review in Emerging Infectious Diseases does an outstanding job of summarizing the evidence of a major if not primary role for aerosoltransmission.
综述了已发表的支持气溶胶传播的结果，以评价这种传播方式的重要性。
3
The aerosol mode of transmission has also led to infection in laboratory workers.