By Sangmi Cha

While the 247 cases are not directly linked to new domestic infections, with the destroyer having left South Korea to start its mission in February, the surge comes as the country battles its worst-ever outbreak of COVID-19 cases at home, with another 1,252 new infections reported for Sunday.

The country’s Joint Chiefs of Staff said on Monday that just 50 of the ship’s complement of 301 personnel have tested negative in an outbreak first reported on July 15. Authorities have begun an operation to airlift them home, while a replacement team will steer the vessel back home.

Sunday’s number meant new cases in South Korea, which has so far fared better than many industrialised nations in case numbers and deaths, have topped 1,100 a day for nearly two weeks in an outbreak stoked by a surge in highly transmissible Delta variant cases.

So far, South Korea has recorded 179,203 cases and 2,058 deaths. Some 31.4% of its 52 million population has received at least one dose of vaccine, while 12.7% have been fully vaccinated.

Helped largely by vaccinations of the elderly and the vulnerable, the latest surge in case numbers has yet to be accompanied by a significant increase in hospitalisations or deaths, with a mortality rate of 1.15% and the number of severe cases at 185 as of Sunday.

Citing military sources, Yonhap news agency reported none of the affected personnel aboard the destroyer were classified as severe cases, though one person has developed conditions that require close observation.

The defence ministry had said noone aboard the destroyer had been vaccinated as the unit had left the country in February, before a vaccination campaign began for military personnel.

Authorities had decided vaccination at sea was not a viable option as it would limit monitoring for any allergic reaction such as anaphylaxis due to the nature of the operational mission.

The ship would not meet the cold-storage requirements for some vaccines, including Pfizer/BioNTech vaccines for soldiers aged under 30, the Korea Disease Control and Prevention Agency (KDCA) said in a statement.

South Korea has excluded people below 30 from receiving AstraZeneca or Johnson & Johnson vaccines over risk of rare but serious blood clots linked to the shots. (Reporting by Sangmi Cha; Editing by Kenneth Maxwell)

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