Do you find you often/always get sick after "hooking up" with someone for the first time?

I’m recovering from what I believe to be the flu at the moment. I’m also going through a rough time relationship wise and so I’ve had a lot of time to just lay here in bed and think. And it occurred to me that most of the times I’ve been ill in the last 4 or 5 years, have been almost immediately following “hooking up” with a new girl. I can think of five times, where a new g/f or fling or what have you, and I, go to at least 3rd base… and less than a week later I’m ill. Either strep throat or the flu in every case. The girl in each case is not ill, nor does she get ill. Further “interactions” after my recovery do not lead to repeat sicknesses. And to my knowledge all of them were clean.. In fact I would go on to date 3 of them long term.

I’m wondering if anyone has any explanations, or if I’m the only one to have this kind of “luck.”