The coronavirus has been detected in one of the camps in southern Bangladesh that are home to more than a million Rohingya refugees.
Humanitarian groups have warned that the infection could devastate the world's largest refugee settlement. An ethnic Rohingya refugee and another person have tested positive for Covid-19, a senior Bangladeshi official and a UN spokeswoman said.
It was the first confirmed case in the camps, which are more densely populated than most crowded cities on earth. "Today they have been taken to an isolation centre after they tested positive," Mahbub Alam Talukder, the Refugee Relief and Repatriation Commissioner said.