Originally Posted by
GeeWizDriver
Politico says CDC data indicates a “precipitous drop” in efficacy after a fairly short time. Like 6-8 months.
Define “efficacy.”
If by efficacy you mean resistance to reinfection, about 9 months would be consistent with what happens with the other four common human coronaviruses that cause (in most people) simple colds. In those four coronaviruses, which we have pretty much all already had, ~9 months after your last cold the circulating antibodies decrease to the extent that you can be reinfected and have another cold which spikes your antibody level for another 9 months, wash. rinse, and repeat, with the only kicker being that an infection with one of the other three common coronaviruses might give your immunity to the first one a variable degree of boost.
Which doesn’t mean these other common coronaviruses can’t kill you too, if you are sufficiently old with enough comorbidities, or are otherwise immunosuppressed.
https://www.atsjournals.org/doi/10.1....201506-1239LE
https://www.nature.com/articles/s41598-021-83987-3
https://www.sciencedirect.com/topics...ronavirus-229e