The head of the Korea Disease Control and Prevention Agency, Jeong Eun-kyeong at a Thursday hearing in the National Assembly said that this year's influenza vaccines are not toxic and that there is no link between them and the recent deaths.
This comes after growing public concerns, as several people across the country who got the vaccine died shortly after.
The safety of the vaccine had already been in the spotlight after half a million flu shots were recalled last month as they had been stored improperly.
There is no confirmed evidence that the deaths were caused by the vaccine, and some of the people who died had underlying health conditions.
Anaphylactic shock, a serious allergic reaction that can occur after vaccination, was initially suspected on Wednesday as a possible reason for two of the deaths.
But after a thorough review, health officials reported that the likelihood is very low.
The government will continue to distribute flu vaccines and conduct further epidemiological investigations.
Meanwhile, the Korean Medical Association is advising a temporary postponement of vaccinations for a week.
South Korea is providing flu shots to the young and to senior citizens free of charge to reduce the burden on hospitals this winter amid the COVID-19 pandemic.
Over 8 million people have received free flu shots so far.
Han Seong-woo, Arirang News.