I had a severe viral infection before Christmas which put me out of action for 5 weeks, and I'm certain I picked it up while riding on deeply flooded country lanes, awash with who knows what diluted animal fluids and excrements, flushed out of the adjoining farms and fields. Not only did I have the usual flu-like symptoms - headache, chills, fever, and a very painful chest - but I also developed cold sore-like areas around my mouth and nose painful and bleeding. Later chest x-rays proved clear, but blood test levels took some weeks to return to normal. I realised after the onset that during the ride I had not thought to clean the mouthpiece of my drinks bottle, which had inevitably caught spray from the flooded roads. I now make sure it's cleaned before taking a drink!