Echinacea is good! And if you are really serious about not coming down with something, put a big spoon of garlic and ginger paste into a mug, add the juice of one lemon and boiling water ....works every time.
Did a PArkRun two miles from house yesterday morning, almost a PB in the PR, off for a slow 10 miles after the Paris marathon on tele. Was also expecting a delivery from Tesco but they called to say their system had crashed so they couldn't make it, like EVER!!! I did offer to read out the transcript of my order but they weren't terribly interested in that option!
Thought I was being efficient!