Guys, you might want to re-consider eating any meat that hasn't been brought up to at least 165 degrees. A greasy burger (read juicy) or a rare to medium rare steak may not really worth the risks.
As identified by the CDC, eight known pathogens (bacteria, viruses and parasites that cause disease) account for the vast majority of foodborne illness, hospitalization and death in the United States:
Salmonella Clostridium perfringens Campylobacter Staphylococcus aureus E. coli O157:H7 Listeria monocytogenes Norovirus Toxoplasma gondii
Sorry for the buzz kill but these risks seem to be on the increase. A little less grease in the burger may not be what you bargain for in a few hours. 3 people died just last week.