Bill Gates met with Trump in December 2016 and again in March 2017 and both times Trump asked him if HIV and HPV were the same thing. Per Gates, “Both times he wanted to know if there was a difference between HIV and HPV. So, I was able to explain that those are rarely confused with each other.”

Forbes – What Bill Gates Said About Trump And How HIV And HPV Are Different
USA Today – Trump didn’t know the difference between HPV and HIV, Bill Gates says