BCR and infection: Asymptomatic infection was characterized by significant upregulation of key B-cell receptor (BCR) signaling components, including CD79B and SYK, alongside increased expression of major histocompatibility complex class II genes (BoLA-DRA, BoLA-DRB3) and immunoglobulin assembly gene JCHAIN, indicating enhanced antigen responsiveness and partial activation of antibody-related pathways.