* Health and Medical News:Biogen downgrade, Pfizer rises

CNBC's Meg Tirrell reports the latest on Stifel downgrading Biogen and Pfizer making a positive move. CNBC's Brian Sullivan and Melissa Lee weigh in on the biotech sector.

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via Health and Medical NewsHealth and Medical News Pfizer Inc has already had its takeover overtures rebuffed three times by rival AstraZeneca Plc, but investors in the U.S. drugmaker say it can tolerate a little more rejection before going hostile with the deal. AstraZeneca turned down a sweeten...

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