The pink or reddish residue often seen in bathrooms—around sinks, shower drains, tile grout, and toilet bowls—is not mold but a bacterium called *Serratia marcescens*. This microorganism thrives in damp, poorly ventilated spaces where soap scum, shampoo, and moisture accumulate. While generally harmless to healthy individuals, it can pose health risks to those with weakened immune systems, potentially causing infections in the urinary tract, lungs, eyes, or wounds. Because it’s resistant to several antibiotics, prevention is key. To keep pink slime at bay, regularly clean surfaces with disinfectants like bleach or hydrogen peroxide, improve ventilation, fix leaks, and reduce clutter in wet areas. Natural cleaners like vinegar and baking soda can also help. Keeping bathrooms clean and dry is essential to prevent the spread of this bacteria and other harmful organisms.
