Scientists have found that showering under a dirty shower heads can deliver a face full of harmful bacteria. Tests revealed nearly a third of devices harbour significant levels of a bug that causes lung disease.
Levels of Mycobacterium avium were 100 times higher than those found in typical household water supplies. M. avium forms a biofilm that clings to the inside of the shower head. Water spurting from shower heads can distribute bacteria-filled droplets that suspend themselves in the air and can easily be inhaled into the deepest parts of the lungs.
While it is rarely a problem for most healthy people, those with weakened immune systems, like the elderly, pregnant women or those who are fighting off other diseases, can be susceptible to infection. They may develop lung infection with M. avium and experience symptoms including tiredness, a persistent, dry cough, shortness of breath and weakness, and generally feel unwell.
Plastic shower heads appear to “load up” with more bacteria-rich biofilms so metal shower heads may be a good alternative.
[Source]
Chapter: Health :: 30 November 2009
