Free flu vaccination under the national program: when and why (Gangnam OB/GYN, female doctor)

Every change of season brings concerns about the flu, and you might be unsure who in your family should get vaccinated first. To put it simply, individuals with weakened immunity, such as pregnant women, children, and the elderly, are recommended to receive annual flu vaccinations, and many are eligible for free vaccination through national immunization support.

Influenza (flu) is a highly contagious viral disease accompanied by sudden high fever, widespread muscle aches, and coughing. Unlike a common cold, it carries a reported risk of complications like pneumonia or hospitalization, and this burden tends to be greater for those with weakened immunity. In our clinic, we see many patients presenting with similar symptoms at the same time each year, so preparing in advance before the flu season becomes widespread is beneficial.

Who is Eligible for Free National Flu Vaccination?

Through the National Immunization Program (NIP) implemented by the government, the following individuals can receive free flu vaccinations at designated medical institutions. Support periods and detailed criteria may be adjusted annually, so confirmation before vaccination is necessary.

• Children aged 6 months to 13 years. This age group has a relatively higher risk of febrile seizures or pneumonia if infected with the flu, so annual vaccination is recommended.
• Pregnant women. Flu infection during pregnancy is reported to increase the burden due to high fever, complications like pneumonia, and the possibility of premature birth, so free vaccination is supported throughout the entire pregnancy.
• Seniors aged 65 and older. Due to weakened immunity, they face a higher risk of pneumonia complications and hospitalization, so free vaccination is supported to reduce hospitalization rates.

Even if you are eligible for free vaccination, your ability to receive it may vary depending on your health status or allergy history, so we recommend a brief check with medical staff before vaccination.

When is the Best Time for Flu Vaccination?

Flu epidemics typically last from autumn to the following spring. Since it takes about two weeks for antibodies to form after vaccination, getting vaccinated in advance before the epidemic fully takes hold is beneficial for preventive efficacy. Generally, autumn vaccination is recommended, and children and pregnant women are advised to utilize priority vaccination periods.

Blanc OB-GYN operates to allow children and pregnant women to receive vaccinations comfortably after booking, aligning with their priority vaccination periods. Referring to our Vaccination Guide can help you organize the necessary vaccination schedule for yourself and your family.

What are the Effects of Flu Vaccination?

The vaccine is adjusted annually to match the virus types expected to be prevalent, helping to build immunity. However, it's important to note that the effectiveness varies among individuals and does not 100% prevent infection.

• It can help reduce the likelihood of flu infection.
• Even if infected, it is reported to contribute to reducing the risk of progressing to severe conditions such as high fever, pneumonia, and hospitalization.
• Studies report that antibodies formed by pregnant women are transferred to the fetus via the placenta, offering a protective effect for a certain period in early infancy.

If you are preparing for pregnancy, it is advisable to discuss the vaccination timing together. If you need an overall health check-up, you can assess your condition in advance through Pre-Pregnancy Care and Well-Woman Checkup.

Is the Flu Vaccine Safe for Pregnant Women?

This is one of the most frequently asked questions. The flu vaccine is an inactivated vaccine, recommended for administration throughout all trimesters of pregnancy, from the first to the third. Organizations such as WHO, CDC, and the Korean Society of Obstetrics and Gynecology also recommend it for pregnant women.

In the clinic, we often see many women postpone vaccination due to safety concerns. However, it is important to consider that flu infection during pregnancy can pose a burden to both the mother and the fetus. Vaccination timing and method may vary depending on individual circumstances, so please discuss this during your consultation.

What to Watch Out for After Vaccination?

Here's a summary of possible reactions after vaccination and precautions for daily life:

If symptoms are unusual or persist for a long time, it is safer to seek medical attention without overexertion.

Blanc OB-GYN Flu Vaccination Guide

Blanc OB-GYN is prepared to provide flu vaccinations in an environment specialized for women's care. Children aged 6 months to 13 years, pregnant women, and seniors aged 65 and older may be eligible for national immunization support, and autumn vaccination is recommended. Pregnant women can be vaccinated throughout their entire pregnancy.

If you have been postponing checkups for a while, this vaccination can be an opportunity to review your overall women's health status. You can also refer to our guide for Those Who Have Postponed Checkups.

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Dr. Eun-jin Lee, Chief Director (Samsung Medical Center OB-GYN Residency, Member of Korean Society of Obstetrics and Gynecology, Member of Korean Society of Menopause) Dr. Eun-jin Lee's Profile First Published 2025-11-21 / Last Reviewed 2026-06-17

The effectiveness and reactions to vaccination vary among individuals. We recommend confirming the appropriate vaccination plan for yourself and your family through consultation with an OB-GYN specialist.