Dear Wilson,
Usually the influenza is understood in TCM as Wen Bing, pestilential febrile diseases!
You might think of the Yin Qiao San, which could be of some good help, but we don't really use Wu Wei Xiao Du Yin, if there's not much heat toxin. Ma Xing Gan ShiTang could only be used if the patient has the right syndrome of it.
M. H.
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