Humphries is a repeatedly debunked quack.
Ok... looked found this:
https://medium.com/@visualvaccines/why-dr-suzanne-humphries-an-anti-vaccine-activist-is-lying-to-you-about-measles-ce446d0a7e0f
In order to understand what they're talking about I had to look at this study. This seems to be the only place that it can be found on the net. Another link the PDF is corrupted. :
https://jamanetwork.com/journals/jama/article-abstract/336928
Since there is no way to read this. I can only come to the conclusion her work is in question by this lady named Isabella B.
Isabella B seems to run a pro-vaccine twitter account:
https://twitter.com/visualvaccines
"debunked" means nothing to me.