Work to be published soon, by JohnOxford of Barts and The London School of Medicine and Dentistry, also shows that infected volunteers with high cell-mediated immunity get few or no flu symptoms.
Professor JohnOxford, a virologist at leading London hospital, said: "Really, there is very little evidence that masks actually offer much protection against flu.
伦敦医院的病毒学家约翰·奥克斯福德教授表示,戴上口罩就能预防流感的证据十分微薄。
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JohnOxford, Britain's leading flu expert, backed widespread use of the drug and said it was as safe as aspirin.