what are covid-19 variants that are currently in the us ?

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https://www.cdc.gov/coronavirus/2019-ncov/variants/variant.html

What You Need to Know about Variants | CDC
https://www.cdc.gov/coronavirus/2019-ncov/variants/variant.html
B.1.617.2 (Delta): This variant was first detected in the United States in March 2021. It was initially identified in India in December 2020. These variants seem to spread more easily and quickly than other variants, which may lead to more cases of COVID-19. An increase in the number of cases will put more strain on healthcare resources, lead …

https://www.vdh.virginia.gov/coronavirus/variants/

Variants of the Virus that Causes COVID-19 – Coronavirus
https://www.vdh.virginia.gov/coronavirus/variants/
There are currently four variants of concern in the United States that are being closely monitored and characterized by federal agencies. These are B.1.1.7 (Alpha), B.1.351 (Beta), P.1 (Gamma), and B.1.617.2 (Delta) and are discussed in more detail below.

https://www.cdc.gov/coronavirus/2019-ncov/variants/variant-info.html

SARS-CoV-2 Variant Classifications and Definitions
https://www.cdc.gov/coronavirus/2019-ncov/variants/variant-info.html
Genetic variants of SARS-CoV-2 have been emerging and circulating around the world throughout the COVID-19 pandemic. Viral mutations and variants in the United States are routinely monitored through sequence-based surveillance, laboratory studies, and epidemiological investigations.

https://covid.cdc.gov/covid-data-tracker/

CDC COVID Data Tracker
https://covid.cdc.gov/covid-data-tracker/
CDC’s home for COVID-19 data. Visualizations, graphs, and data in one easy-to-use website.

https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/covid-variant/faq-20505779

COVID-19 variants: What’s the concern? – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/covid-variant/faq-20505779
The Janssen/Johnson & Johnson COVID-19 vaccine is 85% effective at preventing severe disease with the COVID-19 virus caused by the delta variant, according to data released by Johnson & Johnson. Currently, the CDC and the FDA state that people in the U.S. who have been fully vaccinated don’t need a vaccine booster.

https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/COVID-19/COVID-Variants.aspx

Tracking Variants
https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/COVID-19/COVID-Variants.aspx
Variants are determined by their genetic sequences. It’s important to understand that genetic mutations of the virus that causes COVID-19, SARS-CoV-2, are expected, and that there are many strains of the virus. Public health, academic, and clinical partners are working together to sequence the genetic material of the virus in California.

https://en.as.com/en/2021/08/10/latest_news/1628601739_788117.html

How many covid-19 variants are there currently in the US …
https://en.as.com/en/2021/08/10/latest_news/1628601739_788117.html
As of publication, the CDC says there are four ‘variants of concern,’ in the US. These are named, due to WHO guideline, Alpha, Beta, Gamma and Delta. Alongside these variants are the ‘variants of…

https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/a-new-strain-of-coronavirus-what-you-should-know

New Variants of Coronavirus: What You Should Know | Johns …
https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/a-new-strain-of-coronavirus-what-you-should-know
Since the beginning of the COVID-19 pandemic, the SARS-CoV-2 coronavirus that causes COVID-19 has mutated (changed), resulting in different variants of the virus. One of these is called the delta variant.

https://www.nbcnews.com/health/health-news/map-track-spread-covid-19-variants-across-united-states-n1256131

Map: Track the spread of the Covid-19 variants across the …
https://www.nbcnews.com/health/health-news/map-track-spread-covid-19-variants-across-united-states-n1256131
More infectious Covid-19 variants have emerged around the world, and experts are saying the United States must adapt to a changed pandemic playing field.. According to the federal Centers for …

https://www.huffpost.com/entry/lambda-covid-19-variant_l_60e71fb6e4b01d28533e6bb3

What The Lambda COVID-19 Variant Means For Us Right Now …
https://www.huffpost.com/entry/lambda-covid-19-variant_l_60e71fb6e4b01d28533e6bb3
The lambda variant is currently a variant of interest, according to the World Health Organization. The delta variant first identified in India is spreading widely in the United States, accounting for the majority of new COVID-19 infections.