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Genetic changes associated with Down's syndrome may happen on all chromosomes, not just chromosome 21, a study suggests.

UNNECESSARY SUFFERING  Despite the availability of a potent vaccine, measles continues to cause outbreaks around the world due to its high transmissibility, spotty vaccine coverage in some poor countries and vaccine avoidance in wealthy ones. The infection has no effective treatment, so researchers are working to develop antivirals.

The number of 8-year-olds with an autism spectrum disorder rose from 1 in 88 (or 11.3 per 1,000) in 2008 to 1 in 68 (14.7 per 1,000) in 2010, the U.S. Centers for Disease Control and Prevention estimates.

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