The sewage-soaked alleys and cramped canvas and bamboo shacks that house one million Rohingya refugees in Bangladesh are a horrifying scene for experts watching the coronavirus pandemic creep closer. The wretched conditions in the camps, where most of the stateless Muslims arrived in 2017 to escape a Myanmar military clampdown across the nearby border, are fertile ground for any disease. The public in other countries are being told to keep two metres apart. That is the width of most paths in Kutapalong, the world’s biggest refugee camp with 600,000 inhabitants. Each shack is barely 10 square metres and they are overcrowded with up to 12 people. Social distancing is “virtually impossible” in the camps, said Paul Brockman, the Bangladesh head of Doctors Without Borders.