Leaders balance optimism with threat of second coronavirus wave

Houston • Trump administration officials spoke optimistically about a relatively quick rebound from the coronavirus Sunday as life within the White House reflected the stark challenges still posed by the pandemic, with Vice President Mike Pence “self-isolating” after one of his aides tested positive.A balancing act was playing out the world over, with leaders starting to loosen lockdowns that have left millions unemployed while also warning of the threat of a second wave of infe