Blinking cough has returned. Decided to immediately visit the doctor. She told me I'm not infectious but I have to stop running this week to make sure the exudate (great word) has chance to clear. Lots of fluids and I should be fine to run on Sunday. I told her about my upcoming half marathon. She did that "hmm" noise which means "that's not a good idea" but very kindly told me I would probably be OK. New favourite doctor.