About three out of four Americans are now, or about to be, under some form of lockdown, as more states tighten measures to fight the coronavirus.
Maryland, Virginia, Arizona and Tennessee became the latest states to order citizens to stay at home, meaning 32 of 50 states have taken such steps.
Meanwhile governors are quarrelling with President Donald Trump about the availability of testing kits.
The US has more than 163,000 confirmed virus cases and over 3,000 deaths.
It surpassed Italy last week as the country with the highest number of people suffering from Covid-19, the disease caused by the virus.UN: COVID-19 border closures have become a new threat to refugees