Not that an infection is good but that should be a lot less of a problem than some of the other possible health problems being mentioned. However, it will probably result in the usual weight loss, etc., and it will take a bit of time to get back to full speed.
This definitely will not help their playoff push but I hope he waits until he's really right to return. This season is not shaping up as being worth putting himself at risk.
If Makar and possibly Q Hughes are in for Canada, and McAvoy is a definite no for USA, that changes things.