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

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

   Five pediatric deaths were reported during the week of Dec. 21, bringing the total number to nine so far during the 2024-25 season. The CDC says levels of the COVID-19 virus being detected in ...

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. Herd immunity - Wikipedia

   en.wikipedia.org/wiki/Herd_immunity

   An individual's immunity can be acquired via a natural infection or through artificial means, such as vaccination. [51] When a critical proportion of the population becomes immune, called the herd immunity threshold (HIT) or herd immunity level (HIL), the disease may no longer persist in the population, ceasing to be endemic .

5. United States influenza statistics by flu season - Wikipedia

   en.wikipedia.org/wiki/United_States_influenza...

   US influenza statistics by flu season. From the Centers for Disease Control and Prevention page called "Disease Burden of Flu": "Each year CDC estimates the burden of influenza in the U.S. CDC uses modeling to estimate the number of flu illnesses, medical visits, hospitalizations, and deaths related to flu that occurred in a given season.

6. Public health experts are warning of a ‘quad-demic’ this ...

   www.aol.com/finance/public-health-experts...

   Public health experts are warning of a ‘quad-demic’ this winter. Here’s where flu, COVID, RSV, and norovirus are spreading

7. Is It Holiday Fatigue Or Covid-19? Here Are The Symptoms To ...

   www.aol.com/holiday-fatigue-covid-19-symptoms...

   The most recent COVID-19 vaccine should offer protection against the XEC variant, Russo says. “The most recent version of the vaccine seems to be reasonably well-matched,” he says.

8. Adaptive immune system - Wikipedia

   en.wikipedia.org/wiki/Adaptive_immune_system

   Immunity can be acquired either actively or passively. Immunity is acquired actively when a person is exposed to foreign substances and the immune system responds. Passive immunity is when antibodies are transferred from one host to another. Both actively acquired and passively acquired immunity can be obtained by natural or artificial means.

9. Flu season is here. Here’s what you can do about it. - AOL

   www.aol.com/flu-season-101337299.html

   Symptoms for COVID-19 can show up later than a cold or the flu, according to the Mayo Clinic. A fever is rare and muscle aches and tiredness don’t happen with a cold.