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As of Tuesday, more than 415,000 cases of coronavirus have been reported, resulting in at least 18,000 deaths.

"We think stocks are really cheap if you believe ... that the economy is going to eventually recover, as will the P/E multiples," value investor Bill Nygren told CNBC.

Members of the White House coronavirus task force urged those leaving New York City to self-quarantine for 14-days in order to stop the spread of COVID-19 during a press briefing on Tuesday.

Cramer said on "Closing Bell" that investors should be cautious after Tuesday's big rally.

In market terms, think of the coronavirus as a three-legged stool where if one of the legs isn't firmly attached, the whole thing will tip over.

Amazon's stock price is down 11% since the market peaked on Feb. 19, while Apple, Microsoft, Alphabet and Facebook have each plunged more than 20%. And that tells you everything you need to know about the company's critical role.

When it comes to how to best help your 401(k) or other retirement funds recover from coronavirus market rout, you may want to take a cue from what successful investors did back in 2008 and 2009. Here's what those investors did, and how quickly their balances recovered.

Nike reported quarterly sales that topped analysts' expectations, thanks to a boost from its digital business and growth in North America.

Check out the companies making headlines after the bell.

The Dow Jones Industrial Average just had its best day since 1933. David Spika of GuideStone Capital says it's too early to get too optimistic.

Experts say the treatment might be the best hope for some patients until more sophisticated drugs are developed.

Despite an increase in engagement on its some of its platforms "in places hit hardest by the virus," Facebook says it's seeing a weakening in its ads business in countries taking actions to reduce the spread of COVID-19.

All eyes are on Congress closing in on a much-needed stimulus bill to rescue the economy from the coronavirus damage.

The lack of personal protective equipment has also limited the number of coronavirus tests that CVS sites are able to do.

The Dow logged in its best day in 87 years as investors hoped U.S. lawmakers were close to an agreement on a stimulus bill.

Sen. Mitt Romney has tested negative for coronavirus, he announced in a post on Twitter on Tuesday, but will remain quarantined and unable to cast his vote.

Expectations of a fiscal stimulus package passing through Congress gave stocks a massive lift off their lowest levels in more than three years.

President Trump's remarks came as more states imposed extreme measures to try to slow the spread of the coronavirus.

Microsoft co-founder Bill Gates said the US didn't act fast enough on the COVID-19 pandemic.

Though Twitter's usage is up, the broader economic environment is likely to have a big impact on advertiser spending.