MS-3632

MS-3632

A 49-year-old male presents to the emergency department with severe back pain. He rates this pain as 7/10. His past medical history includes asthma, for which he takes salbutamol inhalers, and constipation. Although he usually takes laxatives, these were stopped following a few recent episodes of bloody diarrhoea. A significant family history exists for cardiovascular disease, and he neither smokes nor drinks alcohol. On examination, there is symmetrical, ascending weakness in the lower limbs. No further abnormalities were identified on examination.

Which organism is most likely associated with his current condition?