[miander]

I think you misunderstood what he meant... How is a private investigator going to catch him being bitten by an infected mosquito?

[zepto]

The parent mentioned conscience, which speaks directly to my understanding.

Separately, the piece mentions that one person in the world is known to become infected through this vector, making the risk absolutely negligible.

[scrumper]

I took it as a joke about questioning the left-behind-at-home spouse's fidelity, quite a good one too.

[justusthane]

I think you actually misunderstood the joke :)