Pseudomonas is a relatively common bacteria that is harmless to most people.
owever, for those who are immunocompromised, such as patients who are critically ill or premature babies, it can prove fatal, as it did so tragically in 2011 and 2012.
In what has surely been one of the darkest periods for Northern Ireland's health service, four babies died from pseudomonas during two separate outbreaks. Three babies lost their lives at the Royal Jubilee Maternity Hospital, while the fourth baby passed away at Altnagelvin Hospital.
At the time Edwin Poots was Health Minister, and by coincidence I had arranged to shadow him for a day at what turned out to be the height of the crisis.
I sat with him in his ministerial car on the way to Stormont as he prepared to brief the health committee on the situation, and it was clear that he was deeply affected by the deaths.
He ordered the Regulation and Quality Improvement Authority to carry out a review of the outbreaks, and the watchdog published its report in May 2012, making a series of recommendations to prevent a similar tragedy from happening again.
Of course, the fact that pseudomonas was identified before the critical care building admitted any patients is welcome. But the fact that the discovery appears to have come so late that it has put the opening of the new ICU on the long finger is more than regrettable.
We are now more than seven months into the coronavirus pandemic and the health service is on its knees.
At the same time, those in charge have been warning of the dangers of a second wave during the winter months, while behind the scenes they have been drawing up plans to help staff navigate their way through such an eventuality.
So, it is a devastating blow to patients and staff alike that those preparations do not seem to have extended to ensuring the critical care building would be ready to admit patients by its rescheduled opening date - some eight years after it was supposed to be operational.