Parasitology: An Uninvited Guest

Most well-scrubbed Americans would be horrified at the idea of having mites crawling around on their faces. Yet almost half the U.S. population may play host to microscopic parasites, which reside in the facial hair of jet-setters and slum dwellers alike. This is the finding of Manhattan Ophthalmologist Jerry Jacobson. He and Australia's Dr. Frank English reported at a New York Hospital conference that among recent adult patients, 40% had mites clinging to the roots of their eyelashes.

The facial mite, Demodex folliculorum, has been recognized since 1841, but many doctors have...

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