Does everyone become ill if bit by an infected tick?

No: Although ticks can be carriers for some really nasty diseases, many people who have tick bites suffer only from the bite itself.

Not necessarily: In the case of lime disease it is estimated that the tick must be feeding on the body for many hours if not a whole day before the germ is passed in the process.The bite of any tick or insect can be secondarily infected by germs planted within a scratch at the site.