People who die of severe COVID-19 have brain abnormalities that resemble changes seen in Alzheimer’s disease – accumulation of a protein called tau inside brain cells, and abnormal amounts of the protein beta-amyloid that accumulates into amyloid plaques – small studies found. In other news, seniors can safely get the high-dose flu vaccine and an mRNA COVID-19 booster dose at the same time, a new study confirms.

According to separate studies, blood type does not affect susceptibility to Covid-19 in U.S. patients and an inhaled steroid commonly used to treat asthma can help keep patients with mild Covid-19 from getting sicker.

The U.S. Food and Drug Administration gave the green light to AstraZeneca for a new chronic obstructive pulmonary disease (COPD) treatment, Breztri Aerosphere.