Sanjay Mishra

Experts fear the new, rapidly spreading variant will trigger a winter wave and change the course of the pandemic.

For the first time, scientists have created a hybrid of the two seasonal viruses. Their discovery yielded a few surprises.

Nearly 40 percent of long COVID patients suffer from the disorienting condition. Destroyed connections between brain cells may be to blame.

Though they don't yet have their own Greek names, many variants of SARS-CoV-2 continue to evolve and spread.

A new study shows that such cases are still extremely rare and mostly occur in relatively young, healthy patients.

Here's what the science shows so far about whether the BA.2 virus is more transmissible and how it holds up against available vaccines.

Immunity from COVID-19 vaccines fades over time, but data show boosters do offer better protection against all variants—including the more contagious Omicron.

Some artificial sweeteners disrupt the microbes in our gut—possibly in ways that increase the risk of weight gain, diabetes, and heart disease.

Recent brain imaging shows the disease can cause physical changes equivalent to a decade of aging and trigger problems with attention and memory. Exactly why is still a mystery.

A new study shows that such cases are still extremely rare and mostly occur in relatively young, healthy patients.

More infectious than past strains, these subvariants can also more easily escape antibodies from vaccines and previous infections.

For scientists, finding the huge, bizarrely complex microbe is like "encountering a human being ... as tall as Mount Everest.”