Seres Therapeutics shares plummeted more than 76 percent after its drug for preventing a bacterial infection of the large intestine failed. » 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.