Bivalent booster vaccines against SARS-CoV-2 were 37% more effective than older booster shots at reducing the risk of severe COVID-19.

A comparison of two diuretic drugs used to treat heart failure suggested either could be used to treat people hospitalized with heart failure.

A probiotic reduced the amount of Staphylococcus aureus, or “staph,” bacteria in the human gut and nose without harming beneficial gut microbes.