a friend of mine. He’s come back to visit me this week.

That’s correct. How did you know I’ve been entertaining acute viral nasopharyngitis this week?
He wasn’t bad at first- he moved in and was a mild discomfort when I had to start coughing slightly. But now he’s tagged along with me to work and destroyed my bronchial tubes. Who knew this little capsid of RNA goodness could wreck such havoc in all aspects of my life?
He’s starting to pack up his bags, though. He never stays longer than a few days.
Goodbye, rhinovirus. It was a good few days, but to be quite frank, I’m glad I won’t have to dose up on anti-cold drugs from here on out.

