Field photos Ticks Black-legged tick questing (waving arms trying to snag a nearby host – ahem, me). This is the primary vector of Lyme Disease in humans. Black-legged tick questing (waving arms trying to snag a nearby host – ahem, me). This is the primary vector of Lyme Disease in humans. Black-legged tick questing (waving arms trying to snag a nearby host – ahem, me). This is the primary vector of Lyme Disease in humans. Share this:EmailTwitterTumblrFacebookRedditLike Loading...