I wrote a post about this about a month back, and hosted a podcast on a related subject a while back too. But TL;DR, Europeans did die in large numbers from a New World disease -- syphilis. That this has exited the zeitgeist has more to do with the success of penicillin -- and the popularity of the pre-Columbian hypothesis -- in the 20th century.

While waiting for other answers, you can look at the FAQ section at https://www.reddit.com/r/AskHistorians/wiki/nativeamerican#wiki_disease_in_the_americas . In the app, the # anchor doesn't work, so you can go about 1/3 of the way down, or search for: Impact of indigenous diseases on the Europeans

Mentioning previous answers is not intended to discourage further discussion. Further questions, data, or debate are welcome.