My sis is a primary school teacher - she loves it and she never catches anything from any of them and noone has ever puked in her class either.

All I can say is don't let emet stop you chasing your dreams! I was put off doing my job because it involves a lot of vomiting but I just had to bite the bullet and do it as I refuse to let emet come before my love for my profession. I regularly encounter vomit at work and at first it freaked me out but I'm now almost ok with it