Long stay in an ICU? Study finds > 1 month stay means a gut almost exclusively populated by pathogenic species... and a greater chance of sepsis.

FTA:

After a long stay in the Intensive Care Unit only a handful of pathogenic microbe species remain behind in patients' intestines, a study has shown. The team of researchers tested these remaining pathogens and discovered that some can become deadly when provoked by conditions that mimic the body’s stress response to illness.