A Chinese security guard, holding a temperature gun, stops vehicles so they can scan a barcode to determine if they are safe to enter a commercial complex in Beijing on Monday, January 25, 2021. China posted its biggest jump in Covid-19 cases in more than five months last week, stepping up containment measures that have seen four cities put under lockdown, as the world's second biggest economy scrambles to head off a new wave of infections. Photo by Stephen Shaver/UPI