I ate an undercooked shiitake mushroom. whats the likelihood i get shiitake dermatitis? is there any way to prevent it now that ive eaten it? i hadnt realized you couldnt eat them raw?

Shiitake dermatitis has not been studied in detail. In one report, it occurred under half of persons who eat raw shiitakes, but usually affected persons ate more than a single mushroom, so your risk may be low. It seems likely that inducing vomiting would reduce the risk, but only within a few minutes of ingestion. There is nothing to be done after exposure. The good news, however, is...