Cold Sore Source

Some 90 percent of people are infected with the herpes simplex virus type 1 that causes cold sores, but a much smaller percentage actually get the sores. Jürgen Haas from the University of Edinburgh and Ludwig-Maximilians University Munich and his colleagues report in PLOS Pathogens that those who experience effects of infection typically have a SNP in the IFN-λ3, or IL28B, promoter.

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