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As others have probably been doing I have been reading up on the lastgreat pandemic, in her book Pandemic 1918: The Story of the Deadliest Influenzain History, Catharine Arnold quotes one study thus:
At Repton, a boys' boarding school in Derbyshire, the school doctor experimented by administering tobacco snuff to the boys and spraying their throats with a solution of potassium permanganate, an inorganic chemical compound used as an antiseptic, with apparently successful results: the rate of infection was low.
While too small a study to show whether this was effective I thought it was an interesting insight, some also thought that drinking copious amounts of whisky was also a good remedy.