Serratia: Introduction. Serratia: An infectious disease caused by bacteria from the Serratia genus. The bacteria can cause urinary tract infection, pneumonia, respiratory tract infections, endocarditis, osteomyelitis, septicemia, eye infection, meningitis and wound infections.This type of bacterial infection shows some antibiotic resistance.isdiagnosis and Serratia. Antibiotics often causes diarrhea: The use of antibiotics are very likely to cause some level of diarrhea in patients. The reason is that antibiotics kill off not only bad bacteria, but can also kill the good bacteria in the gut. This...