The Latest: Director-general defends WHO’s response to 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.—Italy tops 25,000 coronavirus-related deaths.—Germany to start trial for coronavirus vaccine.___LONDON — The head