Well I contracted Lyme Disease about 20 years ago....and never saw the tick; only the red bulls-eye a month later. Just as the KQED video clip predicts, the small tick must have been securely fastened for a couple of days, and then dropped off unseen.
My mistake was that I was sleeping out, and didn't change clothes or take a hot shower for several days after long O runs in Wisconsin...known to be virulent deer tick country, with seasonal Lyme outbreaks even then.
As we discussed
last year, the list of new insect-borne diseases is rapidly increasing because of Global Warming. Here's a CDC list
of diseases currently known to be carried by ticks in the US.