I have been having sore throat and swollen lymph nodes in my neck for the past week. I went to the Dr and got a mono test that came back positive. What I’m confused about is that I had mono 11 years ago at the age of 17. And I’ve always read that you can’t get mono twice. My Dr said that you can get it twice, but everything I’ve read online says it’s either highly unlikely or impossible. So what could have caused me to get it twice?