3 days ago · WASHINGTON (AP) — Flu is rising rapidly across the U.S., driven by a new variant of the virus — and cases are expected to keep growing with holiday travel.

Jun 23, 2025 · A new COVID-19 variant that was unheard of just months ago is now projected to be the second-most common strain in the United States.

Aug 27, 2025 · New cases of COVID-19 are increasing nationwide, fueled by the Stratus variant, an emerging offshoot of the Omicron variant.

Sep 18, 2025 · The latest COVID-19 variant known as XFG, nicknamed Stratus, continues to spread throughout the United States, driving a summer spike in cases.

Aug 28, 2025 · New variants of SARS-CoV-2 are expected to continue to emerge. Some variants will emerge and disappear, while others will emerge and continue to spread and may replace previous …

Dec 24, 2025 · Get the latest COVID-19 news from infectious diseases expert Mark Rupp, MD, including COVID-19 case rates, types of variants circulating and vaccine updates.

Oct 24, 2025 · If a mutation changes how a virus acts in a group of people, it's called a variant. Scientists across the world track the changes in the virus variants that cause COVID-19.

Dec 2, 2024 · When these changes become significantly different to a previously detected virus, these new virus types are known as “variants.” To identify variants, scientists map the genetic material of …

Jun 11, 2025 · Currently making headlines is NB.1.8.1, an omicron variant that popped up in January and quickly became the dominant strain in China and Hong Kong. In recent weeks, NB.1.8.1 has …

Jun 16, 2025 · On May 23, the World Health Organization designated NB.1.8.1 a “variant under monitoring,” meaning that early signals indicate it has an advantage over other variants, but its …