Deutsche Bank's shares slide 10% as bets it will default on its debt soar

• Deutsche Bank shares fell 10% in Frankfurt on Friday as fears about the health of big banks revived.
• The cost of credit default swaps linked to the German bank's bonds —insurance against default — shot up Thursday.
• Investors are fretting about the health of Europe's banks after Credit Suisse's rescue by UBS last week.

Deutsche Bank shares dropped sharply Friday among signs that more and more traders believe it will default on its debt.