Shares are tanking today due to a missed goal in a mid-stage study. CNBC's Meg Tirrell reports. Also, home-grown Zika comes to the U.S. » Read More
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Dan Mangan is a reporter covering health care for CNBC.com.
Meg Tirrell joined CNBC in April 2014 as a general assignment reporter focusing on biotechnology and pharmaceuticals.
Bertha Coombs is a general assignment reporter for CNBC, covering financial markets and business news stories.