Black+Death

http://www.theguardian.com/science/2014/mar/29/black-death-not-spread-rat-fleas-london-plague

http://news.yahoo.com/ingredients-plague-risk-western-us-identified-131810608.html;_ylt=AwrXgSI_gIVWZlgAKfTQtDMD;_ylu=X3oDMTByb2lvbXVuBGNvbG8DZ3ExBHBvcwMxBHZ0aWQDBHNlYwNzcg--

http://arstechnica.com/science/2016/05/plague-village-may-upend-what-we-know-about-how-black-death-is-spread/