Do you want to know why there are so many diseases resistant to antibiotics, and why I personally watch people dying on a daily basis due to these "bugs". It's because of the indiscriminant use of antibiotics that makes the bugs stronger. You think "I'll just take some penicillin (or whatever you can get your hands on), that's left over from that strep throat I had. It's in the medicine cabinet, I'll take that and feel better. Antibiotics do not work that way. Different antibiotics kill different bugs. You need to take them to maintain a certain level in your blood system. It's sort of like going to war. If you have an army of 10,000, what good does it do to send in 1000 one day, 300, the next, 800 the following, and so on. You're gonna' get creamed. Anyways, many times you take the abx the wrong way, the bugs get stronger, and develop an "immunity" to the medicine. Don't play around with antibiotics, pretty soon this world will have no medicine left that the bacteria can't beat. By the way, for the cold, just drink plenty of fluids and use it as a good excuse to get some rest. There's no way to prevent a cold, no matter how good your immune system is. We eat, we breathe, we poop, and we catch colds.