That study is small, observation based and controversial, and the researchers have data from a randomized follow up study that they have been keeping secret for the last 14 years. The coverage of the controversy has mostly been in Danish media, despite these hacks advising the current US administration. See https://www.sensible-med.com/p/the-false-narrative-of-nonspe... for a writeup in English.
And yet, this is a valid concern for any new drug - does it have a net positive benefit ? And can you guess why DTP was replaced by DTaP in the developed world, while people like Gates and orgs like GAVI are still promoting it in the third world ?
