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Anthrax courtesy of Wikimedia Commons/Marcus007 The white powder that arrived in envelopes addressed to lawmakers and journalists in 2001 proved to be a deadly delivery for several people. The lethal substance spores commonly known as Anthrax (from the bacterium Bactillus anthracis ) can cause a toxic reaction in a host’s blood stream , killing cells and leading to tissue damage, bleeding and death

Dengue fever affects 50 million people, with no cure in sight. But maybe prevention could work instead: Scientists have found a way to get mosquitoes sick with a bacteria that prevents them from carrying the disease.