The actual term Expiration Date refers to the last date a food should be eaten or used. Last means last -- proceed at your own risk. Other, more commonly spotted terms are:  1 Sell by date. 2  The labeling sell by tells the store how long to display the product for sale. 3  You should buy the product before the date expires. 4  This is basically a guide for the retailer, so the store knows when to pull the item.
When an animal or person is infected with Yersinia pestis, the bacteria affect the lymph system, causing the characteristic symptoms. If bubonic plague is left untreated, plague bacteria can quickly multiply in the bloodstream, causing septicemic plague. The bacteria could also progress to the lungs, causing pneumonic plague.
By; Jessica Paternoster. The Bubonic Plague, also known as the Black Death, originated from across the Black Sea. Boats docking in Italian ports carried rats and the rats carried fleas, or the hosts of the disease.The rats could stay alive with the infection still small. Though when it multiplied the rat died.y; Jessica Paternoster. The Bubonic Plague, also known as the Black Death, originated from across the Black Sea. Boats docking in Italian ports carried rats and the rats carried fleas, or the hosts of the disease. The rats could stay alive with the infection still small. Though when it multiplied the rat died.