The Latest: US Senator to self-quarantine, staffer positive

The Latest on the coronavirus pandemic. The new coronavirus causes mild or moderate symptoms for most people. For some, especially older adults and people with existing health problems, it can cause more severe illness or death.
TOP OF THE HOUR:
— U.S. Senator to self-quarantine after staff member tests positive.
— Vice President Mike Pence self-isolating after aide tests positive.
— U.K. Prime Minister Boris Johnson announces modest easing of lockdown.— WHO calls report