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By Mike Stobbe The Associated Press

US Zika case sparks questions about sex and mosquito germs

NEW YORK A sexually transmitted case of Zika in Texas has scientists scrambling to understand how much of a risk infection through sex is for the usually mosquito-spread illness.

Experts still stress that mosquitoes are the main culprit in the Zika epidemic menacing Latin America and looming over the United States.

US twin birth rate hits a new high, while multiple births diminish

NEW YORK The twin birth rate hit at an all-time high last year in the United States while the rate for triplets, quadruplets, and higher was the lowest in two decades.

Of the nearly 4 million babies born last year, more than 135,000 were twins. That is about 1 in every 29 babies. In 1980, only 1 in every 53 babies was a twin.

US life expectancy is flat for third straight year; last similar plateau was in the 1980s

NEW YORK Life expectancy in the United States has stalled for three straight years, the government announced Wednesday.

A child born last year can expect to make it to 78 years and 9 1/2 months — the same prediction made for the previous two years.