With at least 324 people being vaccinated against influenza (flu) vaccines suspected of being exposed to room temperature, health officials say they are checking the health status of the vaccinators daily for possible side effects.

Through the explanatory data, the Korea Centers for Disease Control and Prevention (KCDC) explained, "In relation to the monitoring of adverse reactions of government-supplied vaccinations, it was guided to the local government to'perform intensive monitoring by phone or text for one week from the date of vaccination."

He added, "The disease administration also checks the vaccination status and adverse reactions from the local government every day by phone."

Usually, adverse reactions after vaccination are detected when a medical institution reports it to the integrated disease and health management system or a public health center, or when a patient or guardian reports it to a vaccination assistant website or a public health center.

However, this time, as the national vaccination program was suspended due to the unprecedented accident of exposure to the vaccine at room temperature, the health authorities significantly increased the level of monitoring for adverse reactions for those who received the vaccine in question.

The Agency for Disease Control and Prevention is also planning to review measures to track the health of the inoculation over the long term.

Some people in the medical community are raising the opinion that vaccination with exposure to room temperature is unusual and that it is necessary to prepare for possible side effects in the long term.

Currently, the vaccine that has been discontinued due to exposure to room temperature is a dose of 5.78 million people (one dose) supplied to the government by Shinsung Pharmaceutical.