What happened

Another day, another massive stock sell-off in response to the SARS-CoV-2 coronavirus. In trading today, the Dow Jones Industrial Average dropped 3.1%, the Nasdaq Composite was nearly as bad with a 2.8% decline, and the broader S&P 500 fell right in the middle, closing 3% lower.  

As we saw on Monday, some of the worst damage was suffered by stocks tied to travel and tourism. By the time markets closed Tuesday, cruise lines Carnival (CCL 0.67%) and Royal Caribbean (RCL -0.66%) were down 5.1% and 7.3%, respectively. Delta Air Lines (DAL 0.36%) declined 6.1%, and investors showed no love for Southwest Airlines (LUV -0.43%) , which was down 8.2%.

Blue world map with China in red, word CORONAVIRUS and vectors leading away from China

Image source: Getty Images.

So what

But didn't we already know all there was to know about the scale of the coronavirus outbreak Monday? Apparently not.

As the crisis escalates, Johns Hopkins University's website tracking the disease's progress remained hobbled Tuesday, unable to fully configure data on global cases of COVID-19 (the illness caused by SARS-CoV-2).  

And on Tuesday, the Centers for Disease Control and Prevention (CDC) issued a stark warning: It is "inevitable" that the disease will spread throughout the United States. The virus is not contained, it said, and "It's not a question of if this will happen, but when this will happen, and how many people in this country will have severe illnesses."  

Now what

Although it was certainly not its intention to do so, I doubt the CDC could have phrased its message in a way more calculated to cause panic than if it had tried. And the agency then proceeded to urge businesses to begin planning to consider replacing in-person meetings with telework, The Washington Post reported. Schools are being urged to consider internet-based learning, and hospitals are to prepare for triage.

Under these circumstances, the idea of being cooped up aboard ships at sea or inside sealed aluminum tubes in midair translates into bad news for cruise lines and airlines alike.

As Senator Richard Shelby, the Alabama Republican, said today: "I think the American people are very concerned and should be. I'm concerned."

And the stock market is, too.