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2. CDC warns of 'high' respiratory virus activity as cases ... - AOL

   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. 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.

4. 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 ...

5. Antigenic variation - Wikipedia

   en.wikipedia.org/wiki/Antigenic_variation

   Immunity to re-infection is based on recognition of the antigens carried by the pathogen, which are "remembered" by the acquired immune response. If the pathogen's dominant antigen can be altered, the pathogen can then evade the host's acquired immune system.

6. Influenza A vs. Influenza B: Which Flu Virus Is Worse? - AOL

   www.aol.com/influenza-vs-influenza-b-flu...

   There are other, milder types of coronaviruses besides SARS-CoV-2 that are responsible for cases of the common cold, and they can produce similar symptoms as the flu. But the Covid-19-causing ...

7. Coronavirus infection immunity lasts for about 5 months ... - AOL

   www.aol.com/coronavirus-infection-immunity-lasts...

   Of the 21,000 participants, 6,614 had antibodies, and of those, only 44 developed possible new infections, which suggests that being infected with COVID-19 offers around an 83% level of protection ...

8. Influenza B virus - Wikipedia

   en.wikipedia.org/wiki/Influenza_B_virus

   Today, the B/Yamagata lineage might be extinct as a result of COVID-19 pandemic measures, [12] and there have been no naturally occurring cases confirmed since March 2020. [ 13 ] [ 14 ] Although this development has resulted in updated recommendations regarding vaccine composition, [ 13 ] [ 14 ] continued surveillance is required to assess this ...

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

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

   Sep. 21—EDITOR'S NOTE — Today's editorial has been adapted from one that originally ran Feb. 3, 2022. For more information on the new bivalent COVID-19 vaccine and where to get it, visit https ...