The humoral response explains why you rarely get the same illness twice. This response involves B lymphocytes and antibodies, and it relies on clonal selection, clonal expansion, and memory cells to work effectively. If you understand how B cells are activated, how plasma cells make antibodies, and why memory B cells matter, you unlock marks across multiple exam questions. Save this if the humoral response feels confusing right now. Use code ESTRUCH20 for 20% off at @giantmicrobes #gmambassador