The Biogen-developed treatment, called lecanemab, appears to have a more clear-cut effect on slowing the disease than the company’s previous Alzheimer’s drug, Aduhelm.

A protein duo increases transcription of growth-related genes to enhance axon regeneration and boost plasticity, a study finds—but fails to improve mobility.

Researchers made the find using an algorithm that purportedly distinguishes between mutations that were selected for and those that came along for the ride by coincidence, a feat that has long eluded scientists.

The results from two large clinical trials don't support the idea that supplements of the vitamin bolster immune defenses against SARS-CoV-2.

Oil on human skin reacts with ozone to produce highly reactive radicals that can generate toxic airborne chemicals in indoor spaces.

A bacterium that produces an insulin-like peptide can give mice type 1 diabetes, and infection with the microbe seems to predict the onset of the disease in humans, a study finds.

Evidence thus far shows that pregnant people infected with SARS-CoV-2 are at higher risk for severe disease and death, as well as complications in their pregnancies.

BA.2.75 is spreading rampantly in India and has so far reached at least 20 other countries, but it doesn’t seem to be outcompeting other Omicron SARS-CoV-2 subvariants.

The newly authorized intradermal vaccination only requires one-fifth of the usual vaccine dose. This will help stretch out the limited vaccine supply, experts say, but only if healthcare personnel receive sufficient training.

Studies show that a fourth mRNA vaccine dose offers the elderly and other high-risk groups strong protection against hospitalization and death from COVID-19, but experts say benefits for other populations may be more limited.

Research traces the evolution of a gene variant that reduces the risk of Alzheimer’s disease, finding that it originally evolved in response to infectious bacteria.

FEMA official Robert Fenton and a deputy are charged with increasing access to tests, vaccines, and treatment.

A large trial adds to a growing list of conditions once thought to be helped by vitamin D supplementation.

Two independent groups suggest the suite of recent unexplained hepatitis cases may stem from coinfection with an adeno-associated virus and a helper adeno- or herpesvirus, a duo which may be especially virulent in children with a particular genetic variant.

The Scientist spoke with Brigham and Women’s Hospital and Harvard Medical School researchers Scott Weiss and Yang-Yu Liu, who propose that people bank stool samples when they’re young and healthy so that they can be transplanted to rejuvenate the gut microbiome later on.

More cancer cells are shed from primary tumors when individuals are asleep than when they’re awake, according to observations in mouse models and a small cohort of breast cancer patients.

Health data from 5,744 adults over the age of 50 reveals an association between stressors such as discrimination and a relatively small proportion of younger infection-fighting immune cells.