Effect of a head cold?

Really disappointed with tonights 10 time in our club champs. Last week same course, windier conditions I did a 22:43, nicely coming into form for some big races. By Sunday evening I have a sore throat, this morning didn't feel great at all, throat is on fire. Managed to tame it during the day with some strepsils and a couple of pain killers at lunchtime, but tonight I was over 45s slower, when most otrhers were slightly faster...can a cold virus make this much difference? Nothing hurt, legs felt ok just a bit weak, breathing was very laboured, and just couldn't get on top of the gear.
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I got a head cold the day after a TT, it turned into a chest cold, I was off the bike for 9 days.
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Kona Jake the Snake
Merlin Malt 4
Sod's Law... Just when it's all coming on form...
Stick at it... Your cold will pass, and the form will return, but you'll have to wait until next year to challenge for the laurels within the club!