Should you panic about a disease outbreak?

How worried or anxious to be about an epidemic, and how to stay calm while following advice.

Axis: stay alert, not anxious ... treat it as a reason to panic

Answers by date: 4 records in 3 sources, newest first; the answers above are the current ones. The advice was refined (2020), never reversed, in these records.

date	who	answer	source
2020-03-23 (said on 2020-03-21, implied)	Thomas Pulimood	Thomas Pulimood says panic helps nobody and can spread more widely than the virus itself, doing great harm; people should wind it down and ramp up their preparedness instead: prepared, not panicking.	10 Tips for COVID-19 (Coronavirus) - Advice from a Respiratory Physician 00:02:26
2020-03-23 (said on 2020-03-21, implied)	Ali	Ali sums up the first of Thomas Pulimood's ten COVID-19 tips: preparedness is the key, rather than panicking.	10 Tips for COVID-19 (Coronavirus) - Advice from a Respiratory Physician 00:00:00
2020-03-11 (said on 2020-03-10, implied)	Ali	Ali urges people to be alert, not anxious: panicking is never the right answer, but COVID-19 looks more and more like a global threat and should be taken seriously.	CORONAVIRUS vs. The Flu - A Comparison 00:11:40
2020-03-07	Ali	Ali endorses the phrase going around social media, "alert, not anxious": stay alert about the coronavirus without being too anxious.	CORONAVIRUS (COVID-19) - The Basics 00:12:39

Dates are upload dates, which set the order. Where the speaker gives a different recording date in the video, it is added as "said on YYYY-MM-DD, implied" (derived from the date said in the video).