“In 21 studies involving more than 104 million participants in Europe, Asia and North America, vaccination against shingles was associated with a 24 percent reduction in the risk of developing dementia. Flu vaccination was linked to a 13 percent reduction. Those vaccinated for pneumococcal infection had a 36 percent reduction in Alzheimer’s risk.

The Tdap vaccine against tetanus, diphtheria and pertussis (whooping cough) is recommended for adults every 10 years, with vaccination among older adults often prompted by the birth of a grandchild, who cannot be fully vaccinated for months. It was associated with a one-third decline in dementia.

Other researchers are investigating the effects of shingles vaccination on heart attacks and stroke and of Covid vaccination on cancer survival.

What causes such vaccine bonuses? Most hypotheses focus on the inflammation that arises when the immune system mobilizes to fight off an infection.”

From New York Times.