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CDC uses viral genomic surveillance to quickly identify and track COVID-19 variants, and acts upon these findings to protect the public’s health. Some variants spread more easily and quickly than others, which may lead to more cases of COVID-19. For the most up to date information about current variants, visit CDC’s COVID Data Tracker.
- Symptoms
COVID-19 is caused by infection with a coronavirus named...
- Vaccines
Everyone 6 months and older should get an updated COVID-19...
- Definitions & Classifications
The SIG has updated its classification system and working...
- Cdc's Role in Tracking Variants
Since early in the COVID-19 pandemic, CDC has led a national...
- Variant Surveillance
Many viruses are constantly changing, including the virus...
- How Coronavirus Spreads
Coronavirus Disease 2019 (COVID-19) is most often spread...
- Ventilation
Good ventilation, along with other preventive actions, can...
- Spheres
SPHERES is a new national genomics consortium to coordinate...
- Symptoms
Sep 1, 2023 · It’s estimated that Delta caused more than twice as many infections as previous variants—in Connecticut, it was estimated to have been 80 to 90% more transmissible than the Alpha variant. In the U.S., in June 2021, after a steady decline in COVID-19 cases and hospitalizations, the arrival of Delta coincided with a rapid reversal of that trend.
- kathy.katella-cofrancesco@yale.edu
Mar 27, 2024 · Tracking SARS-CoV-2 variants. All viruses, including SARS-CoV-2, the virus that causes COVID-19, change over time. Most changes have little to no impact on the virus’s properties. However, some changes may affect the virus’s properties, such as how easily it spreads, the associated disease severity, or the performance of vaccines ...
Variants of severe acute respiratory syndrome coronavirus 2 ( SARS-CoV-2) are viruses that, while similar to the original, have genetic changes that are of enough significance to lead virologists to label them separately. SARS-CoV-2 is the virus that causes coronavirus disease 2019 (COVID-19).
Dec 18, 2023 · Since the beginning of the COVID-19 pandemic and with the evolution of the SARS-CoV-2 virus, multiple COVID-19 Variants of Concern (VOCs) and Variants of Interest (VOIs) have been designated by WHO based on their assessed potential for expansion and replacement of prior variants, for causing new waves with increased circulation, and for the need for adjustments to public health actions.
Dec 27, 2023 · For the past year, Covid-19 variants have circulated in a sort of alphabet soup. Right now, two variants, JN.1 and HV.1, comprise more than half of Covid cases in the United States.
