By Sarah N. Lynch WASHINGTON (Reuters) -The United States will not lock down again to curb COVID-19 but “things are going to get worse” as the Delta variant fuels a surge in cases, mostly among the unvaccinated, top U.S. infectious disease expert Dr. Anthony Fauci said on Sunday. A sufficient percentage of Americans have now been vaccinated to avoid lockdowns, Fauci said on ABC’s “This Week”. “Not enough to crush the outbreak, but I believe enough to not allow us to get into the situation we were in last winter,” he said. The average number of new coronavirus cases reported nationwide has near…

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