This fetid bottom-feeder is an important part of the natural ecosystem, but can become malevolent if given the opportunity, displaying various resistances to apothecary attacks of late. If this agent is killed by metronidazone combined with cefotaxime, aztreonam OR ceftriaxone, then the pestilence player suffer 1 extra point of damage from this attack. Because of its high level of antibiotic resistance, it has been suspected that B. fragilis acts as a sleeper agent and becomes a reservoir for resistance in other more highly pathogenic pestilence agents.