Since Jonas Salk came up with his polio vaccine, infantile paralysis has virtually disappeared from the United States.

A．surfaced with

B．raised the price of

C．discovered

D．elevated

对于伤寒的患者应采取何种隔离方式（）

A.经空气传播感染的隔离

B.经飞沫传播感染的隔离

C.经接触传播感染的隔离

D.保护性隔离

E.多重耐药菌患者的接触隔离