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The ongoing avian H7N9 influenza outbreaks in China have caused significant human fatal cases and the virus is becoming established in poultry. Mutations with potential to increase mammalian adaptation have occurred in the polymerase basic protein 2 (PB2) and other viral genes. Here we found that dual 627K and 701N mutations could readily occur during(More)
Urban traffic tunnel is a new and effective urban transport mode. The operation managerial experience about urban traffic tunnel is deficient. According to the needs of urban traffic, this paper studied the structure of urban traffic tunnel and designed the safety evaluation index system of urban traffic tunnel. The safety evaluation index system considered(More)
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