By Nell Greenfieldboyce | NPR
As scientists struggle to understand the threat posed by Zika virus, there’s another viral infection that’s a known danger in pregnancy and that harms 100,000 babies a year, even though it has been preventable with a vaccine since 1969.
The disease is rubella, or German measles. Like Zika, the rubella virus often causes either a mild rash or no symptoms at all.
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