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VirScan reveals viral history in a drop of bloodFrom a single drop of blood, researchers can now simultaneously test for more than 1,000 different strains of viruses that currently or have previously infected a person. Using a new method known as VirScan, researchers from Brigham and Women's Hospital (BWH) and Harvard Medical School tested for evidence of past viral infections, detecting on average 10 viral species per person. The new work sheds light on the interplay between a person's immunity and the human virome -- the vast array of viruses that can infect humans - with implications both for the clinic and for the field of immunology. The team reports its findings in Science on June 5.