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2. Respiratory virus activity is 'high' as cases increase in US: CDC

   www.aol.com/respiratory-virus-activity-high...

   Respiratory illness activity – a measure of how often conditions like the common cold, flu, COVID-19, and respiratory syncytial virus are diagnosed – is currently "high" in the United States ...

3. Variants of SARS-CoV-2 - Wikipedia

   en.wikipedia.org/wiki/Variants_of_SARS-CoV-2

   A study of samples collected in Manaus between November 2020 and January 2021, indicated that the Gamma variant is 1.4–2.2 times more transmissible and was shown to be capable of evading 25–61% of inherited immunity from previous coronavirus diseases, leading to the possibility of reinfection after recovery from an earlier COVID-19 ...

4. SARS-CoV-2 Omicron variant - Wikipedia

   en.wikipedia.org/wiki/SARS-CoV-2_Omicron_variant

   [257] Professor Francois Balloux of the Genetics Institute at University College London said, "From what we have learned so far, we can be fairly confident that – compared with other variants – Omicron tends to be better able to reinfect people who have been previously infected and received some protection against COVID-19. That is pretty ...

5. Antigenic drift - Wikipedia

   en.wikipedia.org/wiki/Antigenic_drift

   Antigenic drift has been responsible for heavier-than-normal flu seasons in the past, like the outbreak of influenza H3N2 variant A/Fujian/411/2002 in the 2003–2004 flu season. All influenza viruses experience some form of antigenic drift, but it is most pronounced in the influenza A virus.

6. Fauci says herd immunity could require nearly 90% to get ...

   www.aol.com/news/fauci-says-herd-immunity-could...

   Herd immunity against the novel coronavirus could require vaccination rates approaching as high as 90%, Dr. Anthony Fauci, the most prominent U.S. infectious disease expert, said in an interview ...

7. EDITORIAL: Editorial encore: Natural vs. vaccine COVID immunity

   www.aol.com/news/editorial-editorial-encore...

   For more information on the new bivalent COVID-19 vaccine and where to get it, visit https://www.vaccines.gov /. There has been much debate about the efficacy of vaccine-induced immunity vs ...

8. GISAID - Wikipedia

   en.wikipedia.org/wiki/GISAID

   GISAID maintains what has been described as "the world's largest repository of COVID-19 sequences", [14] and "by far the world's largest database of SARS-CoV-2 sequences". [7] By mid-April 2021, GISAID's SARS-CoV-2 database reached over 1,200,000 submissions, a testament to the hard work of researchers in over 170 different countries. [ 51 ]

9. SARS-CoV-2 - Wikipedia

   en.wikipedia.org/wiki/SARS-CoV-2

   SARS-CoV-2 is the seventh known coronavirus to infect people, after 229E, NL63, OC43, HKU1, MERS-CoV, and the original SARS-CoV. [105] Like the SARS-related coronavirus implicated in the 2003 SARS outbreak, SARS‑CoV‑2 is a member of the subgenus Sarbecovirus (beta-CoV lineage B). [106] [107] Coronaviruses undergo frequent recombination. [108]