Brazil has recorded more than 4,000 Covid-related deaths in 24 hours for the first time, as a more contagious variant fuels a surge in cases. Hospitals are overcrowded, with people dying as they wait for treatment in some cities, and the health system is on the brink of collapse in many areas. The country's total death toll is now almost 337,000, second only to the US. But President Jair Bolsonaro continues to oppose any lockdown measures to curb the outbreak.<br />''