Visible crew/equipment: Boom mic visible when Marcy is looking at her back in the mirror.
Visible crew/equipment: At the start of the movie when the teens are heading off to the woods in the Jeep, in one of the backseat shots, you can clearly see a cameraman in the rearview mirror. (00:04:00)
Visible crew/equipment: When Paul pokes the dead body with a stick, you can see a diver's arm turning the corpse over.
Answer: They don't know about it. The only resident in town to contract the disease was the hermit. The sheriff even remarks to Deputy Winston on his radio that the kids at the cabin were going on a killing spree and that they had some kind of skin disease, indicating the disease was heretofore unknown to them. It's possible that the hermit's dog was the carrier.
Phaneron ★