The number of people showing a positive result in the IgA/IgG/IgM antibody class in the first (nI) and/or second (nII) blood sampling and simultaneously vaccinated against influenza was: 7 people (1 person in the IgA and 1 person in the IgM antibody class in Opole; 2 people in IgA, 1 person in IgG in Bytom; 1 person in the IgA and 1 person in the IgG in Miasteczko Śląskie); (data not shown). This evidence concerns the gene CD40LG and influenza.