U.S. stocks rallied as investors saw glimmers of optimism in efforts to deliver rapid testing for the new coronavirus. The dollar rose.
The S&P 500 Index climbed for the fourth time in five days, rising 17% over the last week, with health-care shares among the biggest gainers. The Nasdaq 100 advanced nearly 4%, leading the rebound among benchmarks from Friday’s losses. Abbott Laboratories surged after unveiling a five-minute Covid-19 test and Johnson & Johnson announced a vaccine candidate for the virus.