With borders slamming shut, schools and businesses closing and increasingly drastic restrictions on movement in place, tens of millions of people were hunkered down Tuesday, heeding government calls to isolate themselves and slow the spread of the new coronavirus. Shoppers in Malaysia stood in long lines to stock up at picked-over supermarkets. Commuters in the Philippines waited in huge traffic jams at checkpoints set up to take their temperatures before entering the capital city. Officials in seven San Francisco Bay Area counties issued a sweeping shelter-in-place mandate, ordering millions of residents to stay at home and go outside only for food, medicine and outings that are absolutely essential. Fresh moves to contain the virus came even as Wuhan reported just one new case on Tuesday. Malaysia banned foreign travel and is allowing only essential services to stay open. France allowed people to leave home only to buy food, go to work, or do other essential tasks. India shut down the Taj Mahal to visitors. Most schools and entertainment facilities were already closed. The first confirmed cases of COVID-19 were reported in Somalia, which has one of Africa’s weakest health systems after nearly three decades of conflict.