by minksling
I'm not so sure, being that the "Heal All" scroll states..."Remove all wound markers and poison wound markers"
I think Rest Spot would have mentioned both, as above, if it was meant to be poison as well.
...and thematically, resting does not generally fix poisoning, you'd usually require an antidote of some kind. Not that I'm one to usually take a thematic approach to rulings (but this is M&M ...and that means theme theme theme :D)