Bacillus cereus (B. cereus)

Bacillus cereus is a Gram-positive, rod-shaped, spore-forming bacterium found ubiquitously in the environment [1]. It is primarily recognized as a significant cause of food poisoning, manifesting as either an emetic syndrome caused by the heat-stable toxin cereulide or a diarrheal syndrome mediated by heat-labile enterotoxins [1][2]. In addition to gastrointestinal issues, it is an opportunistic pathogen capable of causing severe non-gastrointestinal infections such as endophthalmitis, bacteremia, and meningitis, particularly in neonatal or immunocompromised populations [1][3]. Pharmacologically, B. cereus is notoriously resistant to most beta-lactam antibiotics, including penicillins and cephalosporins, due to the expression of multiple beta-lactamases [3][4]. Effective treatment regimens typically involve the use of vancomycin, clindamycin, or aminoglycosides [1][4]. The ability of the organism to form highly resilient endospores allows it to survive extreme environmental conditions like pasteurization and chemical disinfectants, posing a persistent challenge in both food safety and clinical sterilization protocols [2][5].

Other names

B. cereusBacillus cereus group (sensu stricto)

Antibiotics targeting Bacillus cereus work through various mechanisms including the inhibition of cell wall synthesis (e.g., Vancomycin), the inhibition of protein synthesis (e.g., Gentamicin, Clindamycin), or the inhibition of DNA gyrase activity (e.g., Ciprofloxacin) [1][4].