Dear CharonY,
First of all, thanks for your reply. Perhaps it was my fault that I did not phrase my questions clearer. I know it is possible to clone and express multiple genes into a vector. But since these three genes has different functions and also different targets, my questions are what host to use? And what about the protein expression? Broad spectrum activity are not necessary, as long as they can act against ONE (antibacterial that targets one bacteria and so on) would be more than enough.
Once again, thanks alot!