CK, from what I have been able to look up about these two types of bacterias is that they are ubiquitous in the environment, but mostly anaerobic (in water), These two are among the bacterial infections that can be caught in hospitals, nursing homes, and dialysis centers. The Serratia liquefaciens in many cases is picked up with the use of catheters, or any tubing used with the body. There are antibiotics used to combat these, but a suseptibility test is needed to see which ones may work. These two bacterias are becoming increasingly resistant to antibiotics. Being seen at the Mayo Clinic is probably the best thing you can do when dealing with a tough medical issue. Please keep me informed with your progress, I hope you feel better soon!