If a person is diagnosed with COVID-19 in the United States right now, it’s almost certainly caused by the Delta variant. The highly transmissible variant, which caused crippling surges in India and Britain this past spring and fueled case spikes in the United States this summer, is now responsible for over 99% of all cases…  read on >  read on >

A study of millions of people vaccinated against COVID-19 has identified those at greatest risk of hospitalization and death after breakthrough infection. The most vulnerable are those who are immunosuppressed from chemotherapy, a recent bone marrow or solid organ transplant, or HIV/AIDS. Also at risk are people with neurological disorders (such as dementia and Parkinson’s…  read on >  read on >

It’s not just athletes on the field who suffer when outdoor temperatures get too high. Members of college and high school marching bands are at increased risk of heat-related illness, too, researchers warn. “They go out there, and they often wear these really heavy wool uniforms,” said lead author Andrew Grundstein of the University of…  read on >  read on >

Emotional changes in the run-up to menopause can sometimes lead to depression. It can be important to see a doctor to help determine whether you’re just feeling stressed or “blue” — or whether you might have clinical or major depression, a condition associated with a chemical imbalance in the brain. Changing hormones during perimenopause —…  read on >  read on >

It’s no wonder many teens are pooped out. “The obligations of school, work, family and friends make it hard for teenagers to get sufficient sleep to perform their best,” said Dr. Raman Malhotra, president of the American Academy of Sleep Medicine (AASM). “While it might seem like teens sleep a lot, most are sleep deprived…  read on >  read on >

Shedding excess weight does much more for the long-term heart health of young people than building muscle, new research suggests. It’s not that gaining muscle while young proved to be a cardiovascular problem. It’s just that losing fat offered bigger heart benefits. “We absolutely still encourage exercise,” said study lead author Joshua Bell, a senior…  read on >  read on >

In kids and teens, symptoms of long COVID rarely last more than 12 weeks, a new international study reports. The researchers also found that exposure to the highly contagious Delta variant did not result in more serious disease in children compared to earlier variants, and that most cases of COVID-19 were asymptomatic or mild. Despite…  read on >  read on >

U.S. Food and Drug Administration advisors will meet Friday to consider whether it is safe and effective for Americans to receive a third “booster” dose of the Pfizer-BioNTech COVID-19 vaccine. The FDA posted the materials it intends to use in the review on Wednesday. The advisory panel will review a variety of evidence, including new…  read on >  read on >