Lower-than-expected earnings and a reduced outlook for WellPoint Inc. took a big bite out of the health insurance giant’s shares Wednesday and the company’s forecast sent a shiver up the spine of the managed-care sector. WellPoint said net income was $643.6 million, or $1.94 a share, and 8.3% drop from the $701.6 million, or $1.89 reported a year ago. Revenue for the Indianapolis-based company was $15.2 billion against last year’s $14.9 billion according to a report at www.marketwatch.com