Staphylococcal enterotoxin B (SEB) (SEB)

Staphylococcal enterotoxin B (SEB) is a potent exotoxin and superantigen produced by the bacterium Staphylococcus aureus. It is a primary cause of food poisoning and is also responsible for non-menstrual toxic shock syndrome (TSS) [1, 2]. SEB functions by bypassing normal antigen processing and directly cross-linking major histocompatibility complex (MHC) class II molecules on antigen-presenting cells with the V-beta region of T-cell receptors [7, 11]. This interaction leads to the massive, non-specific activation of up to 20% of the body's T-cells, triggering a 'cytokine storm' characterized by the overproduction of pro-inflammatory mediators like TNF-alpha and interferon-gamma [14, 15]. Due to its extreme stability and high toxicity via inhalation, SEB is classified as a Category B select agent and has been historically studied as a biological weapon [6, 9]. Therapeutic strategies focus on neutralizing monoclonal antibodies (e.g., Hm0487), toxoid vaccines (such as STEBVax), and immunosuppressive agents to mitigate the systemic inflammatory response [8, 13, 14].

Other names

Enterotoxin type BentBStaphylococcal enterotoxin type B

Neutralization of the toxin to prevent MHC-II and TCR cross-linking; downregulation of the inflammatory cytokine response.