The Latest: Impact of one-dose vaccine on US could take time

WASHINGTON — The White House is tamping down expectations for a potential boost in vaccine distribution if Johnson & Johnson’s COVID-19 shot is approved by federal regulators.
Andy Slavitt, the White House’s deputy COVID-19 coordinator, told reporters that the single-dose shot would undoubtedly help the Biden administration meet its goal of 300 million vaccinated Americans by the end of summer. But he says: “The expectation should not be that there’s an immediat