Interesting....I have never heard of it. I have noticed they seem to be giving more and more vaccines now.
When my cousin came for a three week visit to Buenos Aires, her doctor advised her to get tons of shots and even take anti-malarial drugs. I thought it was completely unneccessary but she got scared into it. Needless to say, she took them...got sick anyway. I didn't take any of them and I was fine.
I know this is probably not the norm but whatever...I try to take the least amount of those things as possible. Immodium works fine for me if I ever really need it. Which I didn't on my trip.
I guess you need to do what you feel comfortable with.