Showering may be bad for your health, say US scientists, who have shown that 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, reports the National Academy of Science.
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