I'm posting this as a tip that may help others.
My first indication of termites was Thursday morning. (Last year they
didn't enter until April; must be the mild NJ winter that moved their
swarming schedule up.) I couldn't get the exterminator to treat the
house until six days later. The termites had been entering almost as
fast as I could vacuum them up. Five minutes later, there would be more.
Scary thought that I'd have to fight them for six days.
The two entry points are at the top miter joints where the three door
casings met. (That door is in a wall that was originally an exterior
wall; since the addition, it's now an interior wall. Slab foundation
under original house and addition.)
Solution: spray water on the entry points. A single spray might last 24
hours or even more, but to be on safe side I spray twice a way. Not a
single one since.