I don't think I would want to excite my immune system. Ever.
Just goes to show how the disease shifts.

If you'd have asked me a month ago, I'd have said the same.
This is the first cold I've caught in 3 yrs, so my own system is normally pretty active, and immune supplements like Vit C are normally a disaster for me, increasing inflammation and giving me a fever. The only nod I give to supporting immune function is half a dose of Lactoferrin every night.
That's probably why it took me so long to get over this: it runs counter to what I would normally do for myself. I finally realized I felt like I do when I forget to take my Lactoferrin. Took extra, waited; took Vit C, waited; etc. Within 24 hrs of immune support I was up and running again.
BUT as always, we may be talking apples and oranges here,
@Woolie.
Regarding immune suppression, I'd also started to note some signs of fungal microbial invasion, showing lower immune function than my normal. I really haven't had issues with bacterial or viral infection, but I have had issues with fungal infection. The defenses involved are different enough, I suppose, to make that possible.
There does seem to be a group of ME/CFSers that catch everything. But I agree it does seem they're in the minority. (Another poll?! lol)