In a decision that clears the way for schools to reopen safely next fall, U.S. health officials on Wednesday gave their final stamp of approval for Pfizer’s coronavirus vaccine to be offered to children aged 12 to 15. The decision, which makes millions more young Americans eligible for immunization, came as COVID-19 cases and deaths…  read on >  read on >

Like certain health conditions including cancer, diabetes and high blood pressure, new research shows that having HIV or AIDS increases a person’s risk of catching and dying from COVID-19. For the study, researchers from Penn State College of Medicine assessed data from 22 previous studies of 21 million participants in North America, Africa, Europe and…  read on >  read on >

Bacteria don’t set up house in the human gut until after birth, a new study finds. Gut bacteria are vital for digestion and overall health, but when researchers examined the stool (meconium) from 20 infants collected during breech cesarean deliveries, they found these critical germs show up in the gut after birth, not before. “The…  read on >  read on >

Strokes are on the rise among people younger than 50, and new research suggests that packing on the pounds during the teen years is a big reason why. The more overweight you were from ages 16 to 20, the greater your risk of having a stroke before age 50, the new study shows. “Given ongoing…  read on >  read on >

Cora Oakley is a rough-and-tumble 4-year-old who loves gymnastics and outdoor activities, particularly if it involves bouncing on a trampoline. It’s hard to tell from looking at her that she was born without an immune system. Kids with this condition can acquire dangerous, life-threatening infections from day-to-day activities as simple as going to school or…  read on >  read on >

It may be possible to treat the thinking problems that result from repeated hits to the head, a new laboratory study suggests. The new experiments with mice are the first to offer a molecular analysis of what happens in the brain after repetitive but mild blows to the head, said researcher Mark Burns. He is…  read on >  read on >