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It has already spread wider than SARS in 2003. It may not sweep the globe as swine flu did in 2009 but is more dangerous. It doesn’t kill at anywhere near the terrifying pace of Ebola in 2014 but can be passed through the air.

Even as the number of new coronavirus cases in China appears to ebb, experts are preparing for a future with a disease that past pandemics have only hinted at.

China’s lockdown of Hubei province, where the outbreak began, gave the world several weeks to throw up its defenses, global health officials said Tuesday. But it hasn’t stopped the virus, with new cases popping up around the globe, potentially seeding a pandemic to come.

“Every virus is different,” said University of Michigan medical historian Howard Markel, who has studied influenza epidemics. “The study of past epidemics has taught me … that anyone who predicts the future based on that is either a fool or lying, because we don’t know.”

The virus has brought together elements that scare public health experts as well as average citizens. In less than three months, it has infected tens of thousands of people. Humans have never faced it, so their immune systems are vulnerable. And there are no vaccines to prevent 2019-nCoV, as the virus is called, or to treat the disease it causes, COVID-19.

One certainty is that new cases will continue to emerge. On Saturday, an American passenger from a cruise ship that docked in Cambodia tested positive for the virus. It raised new worries that disembarked passengers from the boat, previously thought to be virus-free, would seed new pockets of disease.

The U.S. Centers for Disease Control and Prevention said last week that it will begin screening patients with flu symptoms for COVID-19 in five major American cities. The effort is meant to detect whether the virus has slipped into the U.S. despite robust travel screening and quarantines that have caught the fewer than 20 American cases identified so far.

The aspects the new coronavirus does share with other outbreaks are mostly human failures, not biological advantages.

In 1892, authorities in Hamburg, Germany, worried about the impact that cholera would have on their thriving port and initially kept quiet about some cases, allowing the disease to spread, said Markel. More than 8,000 eventually died in the city. And the disease soon arrived in New York.

In Wuhan, local officials have been accused of minimizing the threat from the virus in the early weeks, when it could have been more easily stopped.

Willingness to endure economic disruption is another factor, said Markel. Epidemics are always enormously costly. Stopping trade and movement can slow a disease’s spread but also grinds economies to a halt.

In a study published this month, the Chinese Center for Disease Control and Prevention warned that even with new infections in decline, they could rise again as the economy restarts following an extension of the national Lunar New Year holiday and shutdowns of workplaces and public gathering spaces.

“Huge numbers of people will soon be returning to work and school,” a group of researchers at the Chinese agency wrote in their analysis. “We need to prepare for a possible rebound of the COVID-19 epidemic in the coming weeks.”

Researchers still don’t know many basic parameters of the virus’s biology. One of the most crucial unknowns is whether it can spread when people aren’t showing symptoms. If a large fraction of people can catch and transmit the virus before becoming seriously ill, the odds of halting it with existing measures plummet, according to computer simulations run by the London School of Hygiene & Tropical Medicine.

“This virus has a firm foothold,” said Steven Riley, professor of infectious disease dynamics at Imperial College London’s MRC Centre for Global Infectious Disease Analysis. “There are many more people with it than there ever was with SARS. We don’t want this virus to become an established human pathogen. If it takes off in other parts of the world and remains a relatively severe virus, it would become a new kind of thing.”

The world should get a better view of how significant the outbreak will be in the next few weeks as additional surveillance gives clearer insights into the virus’s spread, said Michael Osterholm, an expert on infectious diseases at the University of Minnesota.

“We are just getting started,” he said. “If this spreads around the world, this will be just south of the 1918 pandemic,” he said, referring to the Spanish flu, which killed millions a century ago. “The next three weeks are going to be critical.”

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