My 22mo had his flu shot. now, i have the flu. i didn't get a shot. how much risk is there that he can still catch it from me?

Depends : The flu shot provides protection from 3 strains of flu per season, those judged as most likely to circulate in a season. There are other strains that may circulate & routine office tests will not identify which strain u have.Providing your 22 mo with some tamiflu (oseltamivir) might be reasonable. If vaccinated> 2wks ago he may have some protection, but close prolonged exposure might overcome it.

Depends on strain: It all depends on which strain you have and if that is included in the flu vaccine. Also, it depends on how long ago your child had the vaccine; if it has been over 2 weeks, he should have a reasonable amount of immunity to the strains covered. I would advise religious hand washing and covering of your mouth around him until you have broken your fever for > 24 hours.