Viruses have no metabolism of their own and must therefore infect host cells in order to replicate. Contact between the virus and the cell surface is a crucial first step, which can also prevent ...

ST. LOUIS -- Even as scientists were confirming that the West Nile virus had reached St. Louis, researchers here already have been trying to pinpoint why the mosquito-transmitted form of encephalitis ...

Locked away in frigid Arctic soils and riverbeds is a world teeming with ancient microbes. Bacteria and viruses that existed thousands of years ago are frozen in time inside prehistoric layers of ...