The transmission mode of from its source was analyzed by microscope and fluorescence Quantitative Polymerase Chain Reaction (qPCR). The removal efficiency by water surface was 94.5%, and had difficulty in penetrating through the surface of the water membrane. A deflection point at the interface between water and air indicated a cluster of that was bonded to the contact surface by some unknown emplastic media. The emplastic media could stick firmly on glass and like glue. Force analysis showed that the surface tension of water is 10 orders of magnitude larger than the net force from the sum of the buoyancy and the weight of , and revealed that the surface tension of water is so large that a bacterium cannot break away from the water surface membrane and escape. The qPCR results showed that no was found in the air from a incubator or the laboratory. The results demonstrate that cannot be transmitted to people through water vapour or aerosol. The experimental results also indicate that water was able to remove most bacteria.
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