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The fight against bacteria that cause strep throat and flesh disease could get help from an HIV drug. http://www.rdmag.com/news/2015/02/can-hiv-drug-beat-strep-throat-flesh-eating-bacteria?et_cid=4432890&et_rid=650445760&type=cta Image: National Institute of Allergy and Infectious Diseases

Prion protein, shown in red, can become infectious and cause neurodegenerative disease. Here four nerve cells in a mouse illustrate how infectious prion protein moves within cells along neurites – wire-like connections the nerve cells use for communicating with adjacent cells. Credit: NIAID