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" ... Figure 4. A representation of antibody titers over time. ... "
" ... Slifka’s team tested antibody titers—evidence that the body’s immune system can fight off the disease—in 546 adults, and 97% of them had sufficiently high titers to protect them against both tetanus and diphtheria. The researchers calculated the half life of tetanus immunity to be about 14 years and the half life of diphtheria immunity to be about 27 years. That means 14 years after a person’s last booster, they still have more than enough antibodies against tetanus to last them another 14 years—and enough diphtheria antibodies to last them double that time. ... "
" ... Ultimately, the researchers’ hope is that the evidence-based modeling study, in their words, “will assist in developing vaccine strategies to control the future trajectory of the pandemic.” One consideration such strategies will have to take into account is that protection from disease isn’t the same as protection from infection. When the researchers cross-analyzed the neutralization titers produced by each vaccine and plugged the numbers into their model, they found that protection from severe Covid-19 held steady, but protection from infection by SARS-CoV-2 declined significantly. By how much, according to their model, depended on the initial strength of the neutralizing antibody response. ... "