If you want up to the minute information about emerging diseases, ProMED-mail is a service run by the International Society for Infectious Diseases and the Federation of Americal Scientists (FAS). The FAS also runs ahead/ILIAD, which specifically tracks infectious animal and zoonotic diseases.
There is also link in the "Navigation" bar of the ProMED-mail site to recent medical product and food recalls and medical alerts.
This is good stuff. But don't read it just before going to bed.