Are we making our immune system lazy with repeated vaccinations?

Repeated vaccinations do not make our immune system lazy. On the contrary, vaccinations train and strengthen the immune system, making it better prepared to fight dangerous infections.

The immune system consists of an innate (rapid, general defense) and an adaptive (targeted, long-term protection) component. Vaccinations activate the adaptive immune system.

Vaccination gives the immune system a safe workout by exposing it to a harmless part of a pathogen (such as a protein, weakened virus, or genetic material). Memory cells (B and T cells) are created that can recognize and destroy the pathogen in the event of a future infection.

Some vaccines require repeated doses or boosters because some vaccines, such as those against tetanus, have a decreasing effect over time, which is why. Revaccination is also necessary when, for example, the virus in influenza and COVID-19 is constantly mutating. Some vaccines, such as hepatitis B, require a series of injections to achieve an optimal immune response.

The idea that vaccinations make the immune system lazy is based on a misconception. Here are some reasons why that is not true. Vaccines simulate infections without harm. They mimic an infection, allowing the immune system to work as it is intended, but without the risks of a real disease.

Author: Prof. Dr. Dirk Devroey - Latest update: 2022-02-22 - Copyright: Clinifacts 2025