This feeling-like-crap state is probably familiar to everyone, and the chances of getting it are much higher when you are often in crowded places than when you stay at home lying under the blanket. Subway poles are the places where dangerous microorganisms will try to stick to your hands. That is why it is wise not to touch those poles if you can. Use your elbow instead, or put gloves on. These germs do not like soft surfaces like the fabric of your clothes, so the chances to catch cold if you do not touch the poles directly are much smaller.