Washington, Mar 10 (AP) The nation’s top infectious disease expert says the U.S. could see significant steps toward a return to the pre-pandemic normal, even before the country reaches coronavirus herd immunity. Dr. Anthony Fauci says best estimates when enough people are immune to end the outbreak range between 70-85% of the population — a figure expected to be attained by late summer or early fall. He says as the pace of vaccination ramps up and the most vulnerable to the virus are protected, some government restrictions could be lifted..