Two thousand covid-19 tests will be immediately carried out at the Moria Reception and Identification Center on the island of Lesvos.
The announcement was made by the President of the National Public Health Organization Panagiotis Arkoumaneas during his visit on Thursday.
It is recalled on Wednesday, the first coronavirus case was reported in Greece's largest migrant camp. The Moria hotspot has been placed under quarantine for two weeks.
The Migration Ministry said the infected man, a 40-year-old Somali, was granted refugee status and a residence permit to live in Greece. He had left the camp on July 17, however he returned in recent days and had been living in a tent outside the camp fence. He is currently isolated in hospital and is in good health.
Arkoumaneas also stated that Health Minister Vassilis Kikilias has ordered the immediate hiring of additional doctors to staff both Mytilini general hospital and the Moria facility.
"We will take all necessary measures to ensure public health on the island," he noted.
Greece recorded 241 new cases of COVID-19 in the latest 24-hour reporting period.
This raises the total number of cases to 10,998.
2,174 are considered to be related to travel from abroad and 4,843 are related to an already known case.
Thirty-nine individuals are in the ICU, and their median age is 68 years. 92.3% have an underlying condition or are aged 70 and above.
Another 154 have been discharged from ICUs since the start of the pandemic in Greece.
The country’s pandemic death toll stands at 278. The median age of all was 78 years and 96% of the deceased had an underlying condition.
Meanwhile, the Athens Municipality's halfway house for homeless people who are addicted to drugs or other substances has also been quarantined, after one covid-19 case was confirmed there on Thursday.
The National Public Health Organization will now test all 80 of the facility's beneficiaries and the 33 members of staff - including 2 doctors and 6 nurses.
Also on Thursday, Development Minister Adonis Georgiadis, his deputy Nikos Papathanassis, and Shipping Minister Yiannis Plakiotakis were told to self-isolate as a precaution, after it emerged that they had been in contact with covid-infected individuals.
Georgiadis and Papathanassis met with a group of foreign investors on Wednesday, one of whom was infected with the novel virus.
The ministries building on Nikis Street in Syntagma, is currently being disinfected and will remain closed until next Monday.
