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Mount Sinai CEO tries to allay Ebola concerns

Through the prism of the Good, Bad and Ugly on Wall Street, here are three top items for investors on Tuesday.

The Bad

The Ebola outbreak has recently been just one more concern hanging over the markets. But Tuesday's early triple-digit decline in the Dow Jones Industrial Average had more to do with worries about slowing European economic growth and jitters ahead of the start of earnings season on Wall Street.

The Ugly

But news that a nurse in Spain became the first person to contract Ebola outside of West Africa was not helping investor sentiment. Dr. Kenneth Davis, CEO of New York's Mount Sinai hospital, warned on CNBC's "Squawk Box" not to look at single cases as evidence of a broader worldwide outbreak.

Read MoreSpanish nurse first Ebola case caught outside Africa

The Good

The Texas Health Presbyterian Hospital Dallas
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The Texas Health Presbyterian Hospital Dallas

If there can be any good news in this terrible story, none of the people being monitored for Ebola in Dallas has shown any symptoms. So far, it appears the virus has not spread to those who came in contract with Thomas Eric Duncan, the first person in the U.S. to be diagnosed with Ebola. He was initially sent home by a Dallas hospital, then was diagnosed with the virus and put in isolation.