Showerhead 'Slime' Linked to Lung Disease: Study

© Getty Images A bacteria which cause lung disease lurks on showerheads, according to scientists. By Kashmira Gander ,  Newswee...

© Getty Images A bacteria which cause lung disease lurks on showerheads, according to scientists.

By Kashmira Gander ,  Newsweek

A lung disease has been linked to the most common group of germs that populate the average household showerhead. The biofilm on metal showerheads was more likely to contain mycobacteria than those on plastic units, according to the authors of the study published in MBio.

Breathing in aerosols of a specific type of mycobacteria can cause nontuberculous mycobacterial (NTM). Most people do not fall ill if they inhale mycobacteria. However, if the organisms attack the lungs, it can trigger inflammation. Left untreated, a chronic lung infection that prompts coughing, shortness of breath, weight loss, and tiredness can occur. Treatment can involve taking antibiotics for at least 12 months.

In the U.S., over 80,000 people, most of them older adults, have NTM​, according to the American Lung Association.

The authors warned NTM infections are “increasingly recognized as a threat to public health” as they can be difficult to treat, and rates are on the rise in the U.S. and other developed countries.

The “hot spots” of mycobacteria were found where NTM is most common, the authors found. Past research showed the disease is most prevalent in Hawaii, Southern California, Florida, and New York City.

Dr. Noah Fierer, study author and Cooperative Institute for Research in Environmental Sciences (CIRES) Fellow and Professor of Ecology and Evolutionary Biology at the University of Colorado at Boulder, said in a statement: “There is a fascinating microbial world thriving in your showerhead and you can be exposed every time you shower.

"Most of those microbes are harmless, but a few are not, and this kind of research is helping us understand how our own actions—from the kinds of water treatment systems we use to the materials in our plumbing—can change the makeup of those microbial communities," he said.

To conduct the study, scientists at the University of Colorado at Boulder and CIRES analyzed swabs taken from 656 household showers across the U.S., as well as 13 countries in Europe.

The team sequenced the DNA of the biofilm, and pinpointed which and how many forms of bacteria live in showerheads.

Mycobacteria was most commonly found in the U.S. That’s probably because chlorine-based disinfectants—which mycobacteria are more resistant to than other bacteria—are more widely used there than in Europe, the authors believe. Bathrooms which received water from the municipal system rather than a well were more prone to the germs.

Plastic heads contain chemicals that enable a wider range of bacteria to grow compared to metal heads, which means mycobacteria may not be able to dominate the ecosystem, the authors surmised. That might explain why more mycobacteria is found on metal showerheads, the authors said.

Matt Gebert, lead author of the study and researcher at CIRES said in a statement: “It's important to understand routes of mycobacterial exposure, especially in the household. We can learn a lot from studying the biofilm that accumulates inside your showerhead, and the associate water chemistry."

The research is the latest to investigate the microscopic germs that populate the surfaces around us. A recent study published in the journal BMC Infectious Diseases revealed the plastic bins used during security checks are the dirtiest places in an airport.

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