There is a paper by Song et al in Antiviral Research 76(2):178-85, 2007 Nov. Title is "Biological evaluation of anti-influenza viral activity of semi-synthetic catechin."
After detailing the nature of the experiments, the abstract concludes with: "The broad spectrum activity against various subtypes of influenza viruses may complement the limitations of current antivirals and contribute for managing potentially emerging influenza pandemic. The structure-activity data of catechin derivatives may usefully guideline future research endeavors for applying green tea catechins as alternative anti-viral agents."
Is this a straw in the wind? The text mentions that catechins work antivirally in a different manner from zanamivir (Relenza) and oseltamivir (Tamiflu).
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