South Korean health authorities are looking into two more COVID-19 vaccine breakthrough infections.
According to the Korea Disease Control and Prevention Agency, among nearly 2.2 million people who have been fully vaccinated two weeks after receiving either the vaccine from Pfizer or AstraZeneca, a total of 31 people had tested positive for the coronavirus as of Thursday.
The figure accounts for roughly 1.4 in 100,000 people vaccinated in the country, which is far lower than the 10.2 in the United States, authorities said.
A "breakthrough case" is when a person is diagnosed with COVID-19 even after receiving a vaccine shot.
Among the 31 breakthrough cases, 20 patients had received the Pfizer vaccine, while the rest received the AstraZeneca vaccine.
By age group, 12 cases involved people aged 80 and older, followed by six cases from people in their 50s.
The KDCA said so far, there have been no deaths or critically ill patients from breakthrough infections.
More than 15 million people, or 29 percent of the country's 52 million population, have received their first dose of a COVID vaccine, and four million have received two doses.
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