covid-19August 5, 2020 Birx warns 9 cities, California’s central valley about increasing coronavirus cases The White House coronavirus task force is warning states about an uptick in coronavirus test positivity rates in a number of new cities this week. Related posts U.K.'s Johnson launches mass testing…Do you need a Covid-19…What's behind workers' hesitation to…Fully vaccinated people can travel…Younger Latino men are Covid's…Salmonella infections in eight states…Salmonella infections in eight states…The U.S. isn't losing to…Virus-killing robot tested for use…In Covid fight, Cuba touts…