According to an old medical maxim repeated in the New England Journal of Medicine last week, symptoms of the common cold, "if treated vigorously, will go away within seven days, whereas if left alone they will disappear over the course of a week." Despite years of intensive research, that wry wisdom is still true: there is no cure for the common cold. But the Journal did have some encouraging words for snifflers. In the same issue it published two studies, one conducted at the University of Adelaide, in Australia, the other at the University of Virginia, demonstrating that use of an...
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