GLLUG meeting, sore throat

I went to London today to give a talk about my research on quality in free software projects at the Greater London Linux User Group. Apparently the attendance was quite high compared to recent meetings, and I hope the people enjoyed my talk. While my talk went reasonably well, I was unfortunately not in the best shape. When I left China, I was feeling quite healthy but after arriving in Europe my joints started to ache and I developed a sore throat. I'm not quite sure why this has happened but maybe it was because of the air conditioning on the airplane. I spent most of Friday in the bed (catching up on e-mail and sleeping) and left the pub after the GLLUG meeting early, but I'm still not feeling quite well.