IgM LPEs detected in a second, crosssectional vaccine cohort of individuals who had serum collected 7-30 days after their second vaccine dose, including four individuals vaccinated post-SARS-CoV-2-infection (VPI), detected all the peptides found in the first vaccine cohort, and one peptide (S661-675) originally detected only in the COVID-19 cohort. Here, CD40LG is linked to COVID-19.