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Cheap shots — typhoid vaccine shows broad coverage

A new trial suggests that a shot confers immunity across age groups for three years.

An inexpensive vaccine against typhoid fever offers protection across age groups and is particularly effective in preschool-age children, a large trial in India finds. The same study shows that vaccinating half the people in a neighborhood confers significant protection throughout its population, researchers report in the July 23 New England Journal of Medicine.

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