Typically P. aeruginosa. A biofilm producing gram negative bacterium important in multiresistant infections, particularly in the immunocompromised and in cystic fibrosis.

Pretty ubiquitous in the environment, especially in lakes and rivers. Often found in vases of cut flowers, and in spa/whirlpool baths, where it is associated with folliculitis.

The ability to make biofilms makes infection difficult to treat, as the biofilm prevents penetration by antibiotics. The biofilm allows the bugs to survive in low nutrient environments.

Antibiotic resistance is a major issue, with specific anti-pseudomonal antibiotics often required viz tobramycin, ceftazidine.

Ingesting pseudomonas doesn’t pose much of a hazard, unless you are on antibiotics already and have a disturbed intestinal flora. Aerosolizing pseudomonas on the other hand can be lethal to mice.