Here is a good tip to prepare your immune system to the Winter attack:
Thyme and oregano found in Italian herb mix are fabulous antimicrobial herbs. If you think that you are coming down with a cold, grate 1 cm piece of ginger, add 2 teaspoons of Italian herbs (oregano, sweet marjoram, thyme, rosemary) in a teapot, add boiling water and cover for 15 minutes. Sip at regular intervals such as a cup every 15 minutes. You may repeat this again two or three times in a day. Do not use herbs that have been stored in the pantry for too long (over than 6 months) since they can harbour moulds. Best to keep them in the fridge.