Several lines of evidence now suggest that two common vaccines against respiratory illnesses can help protect against Alzheimer’s, too. How much brain protection they offer will require more intensive study to quantify, scientists say.

Sisi Ndebele, receives a seasonal influenza vaccine from a nurse at a local pharmacy clinic in Johannesburg, South Africa at 1800 on Friday, April 24, 2020. (AP Photo/Themba Hadebe)