CDC Centers for Disease Control - US based agency  who  monitor disease in
US and do world wide investigation and trouble shooting (like work with an
Ebola outbreak).

And if you want to read a good book,I recommend "The Coming Plague: Newly
Emerging Diseases in a World Out of Balance" by Laurie Garrett, Penquin
Books, 1994.  Scarey, but fascinating.  Sincerely, Pat in SNJ, USA