Because the bacterium is airborne, it frequently strikes in the spring and summer when windows are opened to the home.

The culprit, according to experts, is probably the species Serratia marcescens, a harmless nuisance organism.

Serratia are like HPC organisms not very harmful to the general population.

The best treatment for the bug is for homeowners to keep these surfaces clean using chlorine bleach on a regular basis.

Three to five tablespoons of chlorine added to bowl water, then flushed should do the trick.

Of course, a toilet cake containing disinfectant will help keep the flora to a minimum after treatment.

By keeping sinks, tubs and showers wiped down and also using bathroom cleaner containing chlorine, homeowners can keep Serratia at bay as well.