The Moria facility, which hosts about 13,000 people – more than four times its stated capacity – has been frequently criticised by aid groups for poor living conditions.

The International Rescue Committee called for an urgent increase in healthcare and sanitation services on Lesbos, including sufficient space for isolation and quarantine.

“Social distancing and basic hygiene measures like handwashing are simply impossible to adhere to in Moria, where thousands of people live in close proximity to each other with inadequate access to running water and soap,” said Dimitra Kalogeropoulou, the IRC Greece director.

Since March 1, all migrants reaching Lesbos have been quarantined away from the island’s camps.

Greece has recorded 10,757 COVID-19 cases since the first infection in February, and 273 COVID-related deaths.

In recent weeks it has suffered a surge in cases, which has forced Greek authorities to gradually reimpose restrictions to curb the spread of the virus.

Lesbos is situated just off the coast of Turkey and hundreds of thousands of migrants and refugees have used the island as a staging post in recent years in their attempt to get to mainland Europe. (Reporting by Lefteris Papadimas; editing by Mark Heinrich)