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The liquid in the test kits was found to be contaminated "with organisms such as Enterococcus, Enterobacter, Klebsiella and Serratia species" that could cause illness for people with weakened immune systems, the FDA said.

The scum, often called “pink mold,” is a type of bacteria, Serratia marcescens.

The diagnosis was a rare pneumonia caused by bacteria believed by doctors there to be Serratia marcescens.

Serratia marcescens forms colonies that look pink or red on surfaces that are left damp for long periods — and bathrooms make an ideal habitat.

Serratia, Pseudomonas and Rhodococcus ate away at detritus—from visitors and decaying corpses—that had seeped into Michelangelo’s sarcophagi.