The change of season seems to bring with it a lot of viruses and opportunities for a cold or upper respiratory infection to start. What can you do? The most important thing especially for those of you that are busy is to make sure that you get enough sleep/rest and drink at least half your body weight in water a day.
If you do manage to get sick take emergen c and if needed something like Mucinex to help keep the secrections thin and prevent you from getting bronchitus.
Stay away from chocolate and dairy. This will just make it worse. Hope this helps.