Incorrect:
Nanoparticle-Based Strategies to Combat COVID-19
Magnetic NPs play an important role in the separation of viral RNA from solution before the diagnosis process. The most common MNPs that have drawn attention in the biological application field are iron oxide NPs due to their high magnetic efficiency.
https://pubs.acs.org/doi/10.1021/acsanm.0c01978
Perhaps you missed the part referring to Covid detection.
This is not about the vaccine.