Disease in the Global community

I really did not know of any disease spread in the global community. I really have no idea what kind of diseases are being spread in the gloabal community and thats scary. I was reading our homework assignment and i seen that for homework we will have to read a story about the spread of disease and the global community so i believe i will have more knowledge about that tonight seeing that we will have a quiz on Wednesday. I really wish i knew about about it so i can write more but the truth is i don't :(