Scientists discover a hidden danger of viral infections that vaccines may prevent

Vaccines may provide protection not only against immediate illness caused by viral infections, but also against lasting damage to the immune system, according to new research. Scientists from Pompeu Fabra University discovered mice that were vaccinated before contracting a viral infection showed no signs of immune impairment, unlike those that contracted the virus naturally.

The study, published in Cell Death & Disease, suggests that viral infections could leave behind lasting changes in the immune system, even after symptoms disappear. These changes, traced to the spleen, interfere with the body's ability to mount effective defenses against future threats. However, vaccinated mice maintained normal spleen structure and immune function, demonstrating that vaccination could prevent such lasting damage.

The researchers emphasize that these findings broaden the potential benefits of vaccines, which were previously thought to only prevent the visible symptoms of an infection. The study's implications are significant for public health, potentially influencing policies and perceptions about the importance of vaccination.