G etting vaccinated for the viral illness shingles, which causes a painful rash, could potentially be the next best tool in preventing dementia, a new study published in Nature fi

A large natural experiment shows that the herpes zoster vaccine reduces dementia diagnoses by 20% over seven years. The findings suggest both viral suppression and immune training may play roles in brain health.

Several previous studies have suggested that shingles vaccinations might reduce dementia risk, but most could not exclude the possibility that people who get vaccinated might have other dementia-protective characteristics, like healthier lifestyles, better diets or more years of education.

The US Food and Drug Administration has delayed granting full approval of Novavax’s Covid-19 vaccine despite it being on track to be cleared until Tuesday afternoon, a person familiar with the situation told CNN.

The agency is sitting on a decision to grant full approval for Novavax’s shot, days after top vaccine regulator pushed out.