Add Changing America to your Facebook or Twitter feed to stay on top of the news. 'At the moment the lockdown is causing the main impact in terms of the reduction in cases and deaths,' he said. HOW IS COVID SPREAD AND WHAT TRIGGERS AN INFECTION? Work from top to bottom when cleaning surfaces 3. What is the correct way to clean your surfaces?
Doctors know where the virus came from.
( z0 know :ARG0 ( z1 doctor ) :ARG1 ( z2 location :ARG2-of ( z3 come :ARG1 ( z4 virus ) ) ) )
(z0 / know-01
    :ARG0 (z1 / doctor)
    :ARG1 (z2 / location
              :ARG2-of (z3 / come-03
                           :ARG1 (z4 / virus))))
Doctors know where the virus came from .
z0 :ARG0 z1
z0 :ARG1 z2
z3 :ARG1 z4
z2 :ARG2-of z3