CHICAGO — A clinical trial run by the National Cancer Institute seems to confirm that a single dose of the vaccine used to prevent infection with the human papilloma virus is just as effective as two — and, therefore, also helps to prevent cancer. [STAT & KFF Health News] 

The result could transform efforts to reach the three-quarters of children globally who should receive the vaccines but don’t. The shots prevent cervical cancer and also anal, penile, and some head-and-neck cancers. Worldwide, 350,000 women die from cervical cancer, the most common HPV cancer.

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