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Wiki link Black death
Once infected by the Yersinia pestis bacterium, it is estimated that victims would die within three to seven days. However, this view has recently been questioned by some scientists and historians,and some researchers, examining historical records of the spread of disease,believe that the illness was, in fact, a viral hemorrhagic fever.
ScienceDaily (Jan. 31, 2008) — There's a high probability that people who are prone to herpes simplex virus (HSV) outbreaks can inherit that susceptibility through their genes, University of Utah researchers report in a new study.
Researchers have identified a region on the long arm of human chromosome 21 with high odds--at least 1,000-to-1--of being linked to cold sore susceptibility. The researchers further say they pinpointed six specific genes in that chromosomal region as candidates for making people prone to outbreaks of cold sores (also called "fever blisters"). Cold sores occur when the herpes virus reactivates from its quiescent state within the nerve, infecting the lip, nose, or face.