I find the use of "primary" and "secondary immune response" to be misleading. FWIW "As Hopkins Medicines suggests, the third dose of the mRNA COVID-19 vaccines

I find the use of "primary" and "secondary immune response" to be misleading. FWIW "As Hopkins Medicines suggests, the third dose of the mRNA COVID-19 vaccines- Pfizer and Moderna- is *identical* to its first two doses. "[emphasis mine] From https://www.republicworld.com/technology-news/science/is-pfizer-covid-19-booster-shot-same-as-the-original-vaccine-read-to-know-more.html https://www.republicworld.com/technology-news/science/is-pfi...