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Limited testing has blinded Americans to the scale of the outbreak so far, impeding the nation’s ability to fight the virus through isolating the sick and their contacts, public-health officials say. As of early Wednesday, about 6,500 people in the U.S. had tested positive, data compiled by Johns Hopkins University show, but the Centers for Disease Control and Prevention had reported only about 32,000 tests conducted at its facilities and other public health labs.”