We can track the speed of the outbreak since January, by which time the virus had spread from China to other countries. In South Korea, after an initial spike, the number of new cases has slowed. Hong Kong, Singapore and Taiwan — despite lots of travelers from China — have kept numbers low from the beginning. In the United States, however, we are seeing accelerating increases.

What did the successful countries do that seems to have worked? They began testing early and often. They coupled these tests with careful quarantines of those infected and tracking of where they had been, to better predict where the next outbreaks might occur. The public health systems had surge capacity because funding had been adequate. And authorities largely communicated simple, clear and consistent messages to the public.

One new study, which has not yet been peer-reviewed, argues that without enhanced detection and restrictions on movement, the number of cases in China could have been 67 times higher by the end of February. And had China started acting just one week earlier, there could have been 66 percent fewer cases.

“Who would have thought we would even be having [this crisis]?” President Trump said last week. In fact, the director for medical and biodefense preparedness policy of his own National Security Council gave a speech in Atlanta in 2018 saying, “The threat of pandemic flu is our number one health security concern. We know that it cannot be stopped at the border.” The day after she made this speech, the White House eliminated her unit. (Hat tip to “The Daily” podcast from the New York Times.)

Trump did make one very good decision — to ban most travelers from China from entering the United States, on Jan. 31. That bought the United States time. Alas, that time was wasted as testing turned into a fiasco.

If this were a war, the generals in charge of this operation would have been relieved of their command. Just one comparison: South Korea has tested more than 230,000 potential cases with a population of about 50 million. In the United States, this would be about 1.5 million. In fact, the United States has conducted about 10,000 tests in public health labs (and more in private labs). Per capita, the United States has tested far fewer people than most other advanced countries.

Trump’s most recent, dramatic move — the travel ban on most of Europe — is symbolic of the administration’s actions. The thousands of Americans currently in Europe are apparently exempt, as are a small number of others. More importantly, the disease is already in the United States and spreading. The policy was so poorly thought through that amendments, corrections and reversals were made to the president’s speech within minutes of his having delivered it.

This crisis seems to have been designed to bring out the worst in Trump. The president doesn’t like or trust experts, often explaining that he knows more than they do. He has bluffed and fibbed his way through much of his life and thinks nothing of doing so again — except this time we are not charmed or amused by the bluster but rather frightened.

In most global crises, the United States takes the lead and provides comfort and assurances to the world. In this one, Trump has been mostly AWOL. When he does appear, it is to blame the disease on foreigners and announce policies that are designed to reinforce that view. The broad collapse in global markets is surely in part a reaction to the vast vacuum of leadership in the White House.

Trump views everything from the narcissistic prism of his ego. He dismisses opposing views and insists that even the senior-most members of his administration repeatedly praise him and his leadership at all times. Watching the heads of America’s leading science agencies prefacing their statements with ritual praise for the “dear leader” has been depressing.