British PM in self-isolation as US reels from Covid-19 surge

British Prime Minister Boris Johnson went into isolation after a contact tested positive for the coronavirus, as a stay-at-home advisory came into effect for the United States’ third-biggest city on Monday. The staggering spikes have forced cities and states across the vast nation to implement new curbs to try and stop the spread of the disease, with a stay-at-home advisory coming into force on Monday in Chicago — the third-biggest US city.