Wuhan China I'm sure. Poster's objective is probably not to different from those who insist on "China Virus."
Presumably “Wuhan Corona”? I don’t know if that’s common nomenclature in his circle or just idiosyncratic.
It's an acronym for Wuhan Coronavirus. There are many coronoviruses and it's natural to use the place of origin to distinguish it from others. This is how we name other species and things in general. In science this is called binomial nomenclature.
It’s a virus you get off toilets, obviously. Hepatitis A, perhaps.