"It took just three months for antibodies to the virus's spike protein to wane by some 90%, meaning booster shots are likely on the horizon.
Three months? 90% reduction in antibodies in three months? So some of you are already beyond THAT bend.
"Covid-19" is a viral infection which appears to have been identified in bats where it is called "SARS-CoV-2".
"Covid-19" appears to be defined by the respiratory illness caused by the virus.
(That definition does not seem quite adequate since those who are symptom-free are still diagnosed officially as positive for this infection where it is found in them by various types of tests, while also many found to be infected do not go on to suffer the respiratory illness.)
See:
https://www.merriam-webster.com/dictionary/COVID-19
And:
https://www.who.int/health-topics/coronavirus#tab=tab_1
We can see how in 2020 the designation "COVID-19" had been anticipated to be the name given for the virus in humans, but since then, has apparently been designated instead as the name given to the disease caused by the virus:
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[Heading:] "It’s been sequenced. It’s spread across borders. Now the new pneumonia-causing virus needs a name"
Jan. 23, 2020
"The pneumonia-causing virus, which is spreading rapidly in China and beyond, is currently being identified as 2019-nCoV, shorthand for a novel or new (i.e. “n”) coronavirus (CoV) that was first detected in 2019. [...]"
Extract source:
https://www.statnews.com/2020/01/23/its-been-sequenced-its-spread-across-borders-now-the-new-pneumonia-causing-virus-needs-a-name/
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What does "COVID-19" mean?
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"In choosing the name, WHO [World Health Organization] advisers focused simply on the type of virus that causes the disease. Co and Vi come from coronavirus, Tedros [Tedros Adhanom Ghebreyesus, director-general of the World Health Organization] explained, with D meaning disease and 19 standing for 2019, the year the first cases were seen."
Extract source:
https://www.statnews.com/2020/02/11/disease-caused-by-the-novel-coronavirus-has-name-covid-19/
- - - - End of extract - - - -
Most vaccines are not designed to prevent infection but are designed to prevent serious symptoms. Research is still underway regarding whether the Coronavirus vaccines prevent infection:
https://www.nature.com/articles/d41586-021-00450-z