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Enlarge ImageBusybody. A new study suggests HSV-2, seen here as orange particles, is constantly active even when patients don't have symptoms. Credit: Dennis Kunkel Microscopy Inc./Visuals Unlimited, Inc. Genital herpes comes and goes--at least that's what it looks like to patients. But a mathematical model published in the 18 November issue of Science Translational Medicine suggests that herpes never slumbers. Instead, nerve cells continuously pump out the virus in minuscule quantities over a sufferer's lifetime. If the findings hold, it may be much harder to stop patients from passing on the infection than researchers thought. As many as one...

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