A newborn gets a hearing test. Cytomegalovirus is a major cause of hearing loss in babies. iStockphoto.com hide caption

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After a sperm fertilizes an egg, cells divide in a stage called a blastocyst. Doctors say pregnancy doesn't start until the blastocyst implants into the woman's uterus. iStockphoto.com hide caption

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Click on the map to explore geographic variations in Medicare payments per enrollee. Kaiser Health News hide caption

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Karen Butler could get her American accent back with intensive speech therapy, but she likes her new one. Jane Greenhalgh/NPR hide caption

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XMRV, a mouse virus, may be an artifact of laboratory experiments rather than the cause of chronic fatigue syndrome. Whittemore Peterson Institute hide caption

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A Washington man talking on his cellphone may be taking a health risk, according to an analysis from the World Health Organization that finds a possible risk of cancer from exposure to the devices. Nicholas Kamm/AFP/Getty Images hide caption

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A farmer holds cucumbers in a field in Malaga, Spain. Cucumbers from Spain have been eyed as the source of a disease outbreak in Germany. Jorge Guerrero/AFP/Getty Images hide caption

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