The Ebola outbreak raging through Congo has sickened thousands of people and killed more than 1,500 — and the number of new victims continues to climb.

The situation is dire, but it's hardly unprecedented. Less than five years ago, an epidemic in West Africa killed more than 11,000 people, shattering communities, destroying economies and leaving a generation of orphans behind.

When it was over, world leaders took a solemn vow: Never again. Health officials studied the failures of their sluggish and haphazard response so they would recognize the warning signs of a crisis not to be ignored.

That crisis is now here. Yet with Ebola spreading eastward into Uganda, epidemiologists and aid groups are dismayed by the many indications that the pledge has been forgotten.

The World Health Organization had to spend months begging for the $98 million it needs to set up temporary health clinics and distribute vaccines that could stop the virus in its tracks. The Trump administration has banned Ebola experts from the Centers for Disease Control and Prevention from entering the hot zone. And aWHO committee has turned down three chances to declare the outbreak a global health emergency, taking pressure off of high-income countries to intervene before transmission seeps into South Sudan's refugee camps and explodes.

"Could we be repeating the same mistake we made in West Africa? Absolutely," said Lawrence O. Gostin, who directs the O'Neill Institute for National and Global Health Law and served on several review commissions following the epidemic that ended in 2016.

"I'm bewildered, and deeply troubled," he said. "We're seeing a steady drumbeat of death — which could boil over into a full blown epidemic. We know better than this."

The Ebola virus, which causes a highly lethal hemorrhagic fever, spreads from person to person through infected blood, vomit and sweat. It causes leaky blood vessels and circulatory failure, which starves the body's organs of oxygen — leading to shock and multiple organ failure. Its symptoms, including uncontrolled vomiting and diarrhea, can cause fatal dehydration even before the infection wins out.

Already, the WHO says the year-old outbreak has killed 1,571 people, making it the second largest in history. It is expected to last at least another year.

And it's spreading. A 5-year-old Ugandan boy contracted the virus in Democratic Republic of Congo while visiting his grandfather, who died of Ebola in late May. The boy and several family members who were showing symptoms crossed back into Uganda in June, where they are believed to have had contact with at least 98 people. The 5-year-old was the first of them to die.

Yet the world seems unable to take the steps that worked the last time around.

During the West African epidemic, it was the global outpouring of funds and personnel that allowed Liberia, Guinea and Sierra Leone to squelch the outbreak. The United States committed $3.7 billion and sent troops to the region to ratchet up the response. Several European countries followed suit. This time, the U.S. and other key global powers are mostly watching from the sidelines. On Tuesday, the U.S. Agency for International Development said it would contribute "more than $98 million" to the response in Congo, though the specifics have yet to be announced. And the State Department won't allow the CDC's medical workers — the world's most seasoned interventionists — to go to the region, citing concerns about their safety.

Those concerns are well-founded: The outbreak is centered in North Kivu and Ituri, heavily populated provinces marked by decades of political instability and violent conflict. As many as 134 separate armed rebel groups have sparred for control of the mineral-rich region in recent years, and an explosion of ethnically motivated kidnappings, maimings and sexual violence displaced at least 300,000 people in June alone, according to the United Nations.

"The complexity of the environment in North Kivu is unparalleled," said Juliet Bedford, an Oxford University anthropologist who studied the community dynamics of both outbreaks.

In the hot zone, Ebola response teams are caught in the crossfire. Insurgents have launched more than 150 attacks on health workers so far this year, killing five and injuring about 50 others. Doctors Without Borders, usually a primary player in disease outbreaks, shut down its treatment centers after multiple attacks in February.

Each violent uprising is followed by a surge of new infections as aid workers lose vital ground.

Still, dozens of CDC officials have battled hemorrhagic fevers in violent regions before, and some are eager to get to work in Congo, according to Jennifer Kates, an expert on U.S. global health policy at the Kaiser Family Foundation.

"There are U.S. personnel who believe they have the expertise to help, and they're not able to go," Kates said. "It's coming up again and again."

Others have noted that contractors for the U.S. Agency for International Development are currently operating in the line of fire.

"There are some inconsistencies in our security posture," said Jennifer Nuzzo, an epidemiologist at the Johns Hopkins Center for Health Security.

The WHO committee's reluctance to declare a global emergency deprives the CDC of the leverage it needs to persuade the Trump administration to let its specialists join the front lines.

"High-income countries fear a Benghazi moment: If they let trained experts into the hot zone and they got killed — or worse, kidnapped — it would be a political crisis," Gostin said. "They're gun-shy."

In the West African outbreak, local health workers meticulously tracked down and isolated each patient's potential contacts, essentially snipping each strand of the outbreak's expanding web.

That's not happening this time. It simply doesn't work in a humanitarian crisis, particularly one marked by a deep-rooted suspicion of authority and huge numbers of people on the move. At least 4.5 million Congolese have been displaced from their homes and neglected by the central government — breeding distrust in the very figures who are now leading the Ebola response.

Conspiracy theories about Ebola swirl on social media. Some say it's a biological attack by white Westerners; others say it was spread by the Congolese government. More than a quarter of North Kivu residents don't believe the virus is real, according to a recent report in the medical journal Lancet.

"They've been attacked and killed by various things for ages, and no one did anything before. They're thinking, 'Now, Ebola is here and everyone wants to save us? Yeah, right,' " said Dr. Marta Lado, chief medical officer of Partners in Health in Sierra Leone, who has worked on the ground in both Ebola outbreaks.

The result is that less than one-third of all confirmed cases have been linked back to known contacts, and more than 80% of new cases have not been followed, according to Doctors Without Borders. On a map, the outbreak pattern is made up of erratic clusters throughout the region rather than a cohesive web of cases.

It also means the total case count is likely much higher than the official figures reported by the WHO.

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