Aug 28, 2025 · Some variants will emerge and disappear, while others will emerge and continue to spread and may replace previous variants. It is important to track the emergence of variants …

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 …

Positive, negative, and neutral mutations during the evolution of coronaviruses like SARS-CoV-2. Variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are viruses that, …

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.

20 hours ago · WASHINGTON — Flu is rising rapidly across the U.S., driven by a new variant of the virus — and cases are expected to keep growing as holiday travel plays out. That variant, …

Jun 18, 2025 · Here, you can find out what mutations define a variant, what impact they might have (with links to papers and resources), where variants are found, and see the variants in …

Oct 24, 2025 · Concern over variants, sometimes called strains, of the virus that causes COVID-19 is based on how the virus might change. A virus could get better at infecting people, spread …

Oct 12, 2025 · Strains and variants are different. A variant is when a virus changes (mutates) from the original version—for example, an error in the genetic code happens when the virus is …

For SARS-CoV-2, the emergence of various variants has significantly impacted its fitness, influencing factors such as transmissibility, infectivity, and immune evasion. This section …

Mar 27, 2024 · In late 2020, the emergence of variants that posed an increased risk to global public health prompted WHO to characterize some as variants of interest (VOIs) and variants …