A 26 year old woman presents with a fever, malaise, and a sore throat. She tells you she has bouts of vomiting that subside, but have traces of blood in it. She also tells you she just came back from...

A 26 year old woman presents with a fever, malaise, and a sore throat. She tells you she has bouts of vomiting that subside, but have traces of blood in it. She also tells you she just came back from working with Doctors without Borders in Central Africa. You tell her she's lucky to have come in when she did before the dysentery. What has she contracted?