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Expert Tim Brooks, who’s unrelated to this current finding, theorizes the disease was pneumonic – not bubonic – meaning that coughing and sneezing likely spread the sickness. Then rampant malnutrition perhaps widened its swath.

Everything you know about the Black Death is wrong

Key Dates relating to the event: This terrible plague started in Europe in 1328 and lasted until 1351 although there were outbreaks for the next sixty years

called the Black Death because one of the symptoms produced a blackening of the skin around the swellings.

buboes were red at first, but later turned a dark purple, or black.

spread of the Black Death followed all of the Trade Routes to every country

Nearly one third of the population of died - about 200 million people in Europe The 1328 outbreak in China caused the population to drop from 125 million to 90 million in just fifty years7500 victims of the disease were dying every day

Bubonic plague, the disease's most common form, refers to telltale buboes—painfully swollen lymph nodes—that appear around the groin, armpit, or neck. Septicemic plague, which spreads in the bloodstream, comes either via fleas or from contact with plague-infected body matter. Pneumonic plague, the most infectious type, is an advanced stage of bubonic plague when the disease starts being passed directly, person to person, through airborne droplets coughed from the lungs. If left untreated, bubonic plague kills about 50 percent of those it infects. The other two forms are almost invariably fatal without antibiotics.Yersinia pestis is extraordinarily virulent, even when compared with closely related bacteria. This is because it's a mutant variety, handicapped both by not being able to survive outside the animals it infects and by an inability to penetrate and hide in its host's body cells. To compensate, Y. pestis needs strength in numbers and the ability to disable its victim's immune system. It does this by injecting toxins into defense cells such as macrophages that are tasked with detecting bacterial infections. Once these cells are knocked out, the bacteria can multiply unhindered.Victims are so overwhelmed that they're more or less poisoned to death as the bacilli gather in thick clots under the skin, where a passing flea might pick them up. Other grim side effects can include gangrene, erupting pus-filled glands, and lungs that literally dissolve.

Plague still exists in various parts of the world. In 2003, more than 2,100 human cases and 180 deaths were recorded, nearly all of them in Africa. The last reported serious outbreak was in 2006 in the Democratic Republic of the Congo in Central Africa, when at least 50 people died. The United States, China, India, Vietnam, and Mongolia are among the other countries that have confirmed human plague cases in recent years.Most people survive if they're given the correct antibiotics in time. Good sanitation and pest control help prevent plague outbreaks since they need crowded, dirty, rat-infested conditions to really get going.There are fears that plague bacteria possibly could be used for a bioterror attack if released in aerosol form.