That's interesting on two counts. It verifies my impression that Bite Blocker does repel ticks (for 7 hours!) and that it's as effective as long as DEET on Culex mosquitoes - the primary vector for WNV - but only for 3 hours against Aedes mosquitoes, the primary vector for EEE. So I guess it might depend partially in which disease(s) are prevalent in your area, but personally, I don't like anything on my skin that wouldn't sweat off after three hours, even if it's completely inert. I just don't see what the big deal is about having to spray yourself every two or three hours.