That's because it's not true, Daisies! The tick 'injects' a numbing agent before it actually starts "sucking" blood, it's at that point that at least some bacteria can be injected into the person. I've had body symptoms in as soon as 20 minutes after having a tick attach. And, there are scientific studies that have been done to prove that bacteria can be injected with the numbing agent.
" The salivary juices of the tick, which contain anticoagulants, anesthetics, and immune suppressors, also contain microbes that can be injected at the time of attachment. Transmission of bacteria by ticks attached less than 24 hours has been well documented in animals, and a recent paper last year documented that this can occur in humans as well."
www.ilads.org/lyme/what-to-do-if-bit-by-tick.php#sthash.2BnM7suN.dpuf