2 weeks post-injection was used as the point where efficacy against infection was measured in the clinical trials for the J&J vaccine. The results showed only 66.3% protection starting 2 weeks after the second injection vs the mRNA vaccines that showed >90% protection 2 weeks after the second injection. Since that was how the trial was designed, 2 weeks was accepted by the FDA. But even in the trials, it was noticed that suppression of deaths was not complete until 4 weeks post-injection. Since then it has been observed that antibody levels continue to increase over a longer period of time with the J&J vaccine. That's why some providers (like Vinny) are now recommending waiting longer before you are considered fully protected.
In any case, while protection against severe disease, hospitalization, and death has been holding up for at least 6 months. But there seems to be overall less protection against infection and mild/moderate Covid relative to the mRNA vaccines.
KLS came down with Covid a little more than 2 months after she was vaccinated, which should have been near the peak of protection if she indeed got the J&J vaccine. The Delta variant seems to be causing more breakthrough infection regardless of the vaccine or prior infection status. She contracted what appears to be a mild case of Covid. This is what happens in the majority of breakthrough cases.
High-level athletes are set up emotionally to deal with injuries. They know that if they follow rehab protocols and work hard they can come back. But something like KLS's situation must be much harder on her mentally. There is nothing she can do except wait and see how things turn out. Let's hope that it does not have long-term consequences for her career and overall health.
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