Do you love turning a hot shower stream right into your face? Most of us do, but you might be getting more than a soothing facial cleansing. This is not Norman Bates in an Alfred Hitchcock motel shower scene, but it is scary enough.

Showerheads can grow and deliver a face full of potentially harmful bacteria. Leah Feazel and Norman Pace, who are researchers at the University of Colorado at Boulder, studied 45 showerheads in nine cities, including New York. They found that the water from 40 percent of the showerheads harbored high levels of the respiratory pathogen Mycobacterium avium.

This bug, a close relative of the bacterium that causes tuberculosis, can rarely cause lung disease in healthy people, but more often it infects those with weakened immune systems. The microbe count from the showerheads was more than 100 times greater than background water levels. In a hot shower, these bugs can become airborne in tiny mist droplets, reaching deep into the lungs.

Your indoor environment can make you sick. I touched on this in a column on allergies in the July 30 issue of The Star, but the problem can be more sinister than simple allergies to pet dander and dust mites. Indoor mold can be a much greater threat to your health.

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