I think reasonable caution is warranted, however panic responses are not. In Washington state it appears there had been cases that hadn't been found out about for a week or so that are coming to light now. What happened? An absolute shopping frenzy. Masks being sold out, bottled water (are the taps going to quit???), soap, and hand sanitizers being hoarded, people getting ready to be "quarantined" in their homes. And in the mass frenzy it leaves little resources for others. Reading MSN today, the loose masks that we often see people wearing in pictures are largely ineffective in protecting against viruses from others, but will help in preventing one being spread from ourselves to others. Also, these masks are needed by health care workers and those who might be immunocompromised. One man said his wife was feeling sick. They'd went to the doctor who assured them it was a case of a mild flu, not coronavirus. He was one of the shoppers who was buying everything he could because "you never know"
Just stop, be safe, take reasonable precautions. Are you sick? YES, buy/use a mask and see your doc. Stay home.
(btw, I've been sick for three days. There have been three presumptive cases of coronavirus in the same general geographic area as me. I'm staying home and taking care of myself).