Take some time off and heal.
You won't lose strength. I've taken as much as 2 weeks off and actually came back stronger and I'm probably old enough to be your father.
See the previous answer.
No. They may actually improve. Taking a short time out allows those little twinges and micro-tears to your muscles time to heal.
Take the time off and recover. Rent some movies or play your PS/2, XBOX, etc. read, relax and get well.
Frequent hand washing is the key to preventing illness. You would be better served by carrying around a bottle of waterless hand sanitizer in your gym bag and don't be afraid to use it.
Don't sweat it kid. You'll be back in the gym ripping it up again soon.