The Latest: Britain’s death toll more than 18,000 from virus

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:— AP Exclusive: ER staff saves lives, suffers in hot spot.— Britain’s death toll reaches more than 18,000.— Greta Thunberg urges world leaders to cooperate on virus, climate.— Germany to start trial for coronavirus vaccine.___