[smt88]

You have exactly zero evidence that pairing made you sick. I wouldn't over-think it.

Somewhat unrelated: feeling ill during a commonplace bacterial or viral infection is usually the result of your immune system fighting that infection. For that reason, people who "never get sick" may actually have fairly depressed immune systems.

[sfronczak]

Although I have no evidence, if three people on the team are sick and then I get sick, there's definitely a good chance I got it at work.