Photo: Yonhap News
Eight out of 1,910 people in South Korea who received potentiall defective flu shots have shown abnormal reactions.
The Korea Disease Control and Prevention Agency said on Thursday that two people have experienced chills, headaches and nausea after being injected with vaccines believed to have been exposed to room temperature.
Two others said they developed hives and diarrhea, respectively.
The agency said the conditions of all four people have improved, while the remaining four people also had fever and chills before getting better.
Last week, the KDCA temporarily halted its free seasonal flu shot program after some of about 5 million doses of the vaccines were partially exposed to room temperatures.
Authorities are expected to finalize a study into the safety of the exposed vaccines by early next week.
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