> I have no idea how challenging that is. Technically it's easy, Moderna already has multi target vaccines (for other diseases), one with 7 different targets.

> I have no idea how challenging that is. Technically it's easy, Moderna already has multi target vaccines (for other diseases), one with 7 different targets. It can be as easy as literally creating 7 different vaccine liquids and then mixing them all in a single vial. The problem is deciding what to put in, what ratio, possible side effects, etc... Lots of combinations which can mean lots of expensive and slow clinical trials.