Hell in the Hot Zone As the Ebola epidemic rages, two questions have emerged: How did the deadly virus escape detection for three months? And why has a massive international effort failed to contain it? Traveling to Meliandou, a remote Guinean village and the likely home of Patient Zero, Jeffrey E. Stern tracks the virus’s path—and the psychological contagion that is still feeding the worst Ebola outbreak in history. The tiny village of Meliandou, nestled in the Forest Region of southern Guinea, has begun to see flashes of the outside world. A Messi soccer jersey, three sizes too big, on a little boy. A down parka on an old man in the heavy heat, worn as a robe of distinction. You might even come across the occasional teenager on a cell phone, cupping the device from the sun as if lighting a cigarette in the wind. But mostly it is a place from the past—a rutted dirt path between thatch-roofed shacks, on a hillside sloping up toward the forest. It is home to just a few hundred people. Chickens and goats wander freely. Local shamans are the first responders when illness strikes. In Meliandou, bushmeat has long been a common source of food. As elsewhere in West Africa, hunters wade into the forest and come back with whatever they can find. Once, not so long ago, what they found was a rich and varied bounty: monkeys, antelope, squirrels. That has changed; the whole eco-system has re-arranged itself. After civil wars broke out in Liberia and Sierra Leone, refugees poured over the borders, and the population grew, even as a power struggle in Guinea took an economic toll. People started looking to the rich resource all around them: trees. Trees were felled to make way for farms or burned down for charcoal. Endless truckloads of timber were shipped to construction companies. The forest suffered another trauma as mining interests—the Anglo-Australian Rio Tinto, the omnipresent Chinese—pushed aggressively to exploit the country’s natural resources (bauxite mostly). As the forests disappeared, so too did the buffer separating humans from animals—and from the pathogens that animals harbor. Ordinary life in Meliandou came to an end on the day last December when the Ebola virus, which had last claimed a fatality thousands of miles away, arrived in the village, most likely in the body of a fruit bat—its natural non-human reservoir, according to a virtual consensus among scientists. Mining and clear-cutting had driven bats from their natural habitats and occasionally closer to people, like those of Meliandou. And fruit bats love palm and mango, which ripen in the village’s remaining trees. Bats also feed in colonies, which makes them tempting targets: a single shotgun blast can bring down 10. Ebola is one of the deadliest viruses known to medical science, with no specific cure and mortality rates of up to 90 percent. The Ebola epidemic now raging in West Africa is the worst one in history. It has decimated Meliandou and moved far beyond. But the mystery today is not how the epidemic began—it is why a concerted effort by an army of international experts was unable to stop it. Part of the answer is the chameleon-like character the virus displays in this part of the world. An even larger part lies in the international response itself. It was rapid and comprehensive—exactly what you would hope. But there was an unexpected reaction that undermined everything the experts sought to achieve—and at the same time fooled many of them into thinking they had succeeded in their aims. Eventually they understood the truth. By then it was too late. On the Move As near as anyone can tell, the outbreak started when a few tiny rod-shaped particles—each merely an attack plan coded in ribonucleic acid and wrapped in a protein shell—found their way from a fruit bat into the body of a child not yet two years old. Perhaps, while the mother was preparing the day’s hunt, some of the bat’s blood was flung in the child’s direction. Perhaps, while the mother’s attention was elsewhere, the child touched the animal, then brought his hand to his mouth, the way babies do. Either way, a few strands of the Ebola virus attached themselves to cells in the child’s immune system and used the cells’ machinery to replicate. The boy developed a fever, then diarrhea and vomiting. His organs began to fail. He began to bleed internally and went into septic shock. In four days, he was dead. It might have ended there—one child’s death in the jungle, way back in December—with no one ever to know that Ebola had spilled over into the human population. Certainly this happens often—spillovers that produce outbreaks so sudden, and generally so remote, that they don’t spread. People close by attribute the deaths to some other, more common affliction, while people far away never hear about them at all. In this case, however, a family dispute intervened. After the child was infected but before he died, the mother, who happened to be pregnant, packed up the boy and a daughter and marched across the village to her own mother’s house. Space there was tight, because the grandmother had a houseguest. Beds were shared, and the baby’s symptoms exploded. His mother was infected, his sister, his grandmother, the houseguest too. When the mother miscarried, the midwife was infected. The Ebola virus had started to move. BY NEIL GOWER.SPREADING The Ebola epidemic now centers on three West African countries. When Ebola strikes, it kills quickly, but it can take up to three weeks to incubate, and usually around 10 days. The period is long enough that contact with a possible source may have been forgotten, and long enough for infected people to travel without symptoms. And even if you tested for Ebola—which nobody in Guinea had the capacity to do—you wouldn’t find it during the incubation period: Ebola can’t be detected in the blood until symptoms show. An epidemic can start slowly and go unnoticed for weeks. This has never been much of an issue before, because Ebola tends not to find its way into large population centers, or places where people are very mobile. This time would be different. On January 24, more than a month after the first infection, Jean Claude Kpoghomou, a doctor in the town of Tekolo, called a superior to report on something strange happening in a village under his jurisdiction. Three patients had died in the span of two days, he said. All of them came from the same village, a place called Meliandou. The symptoms looked like cholera: diarrhea, vomiting, extreme dehydration. Cholera outbreaks were not uncommon in Guinea. An especially devastating outbreak had occurred just two years earlier, and Meliandou had even been one of the villages targeted for a public-health education campaign. A big pictographic billboard was installed at the entrance to the village, with explicit instructions for the mostly illiterate villagers about how to avoid contaminating the water supply. Dr. Kpoghomou’s superior forwarded the alert from Tekolo on to the health department’s prefectural authority in Guéckédou. Guéckédou sent the alert up to the regional director of health in Nzérékoré, who sent it on to the Ministry of Health in Conakry, the country’s capital, a city of a million and a half on the coast several hundred miles away. The national government had now been alerted: a potentially serious crisis was developing down in the Forest Region. Mistaken Identity A mid the constellation of public-health crises that Guinea must contend with—under-resourced and overburdened as it is by a constant onslaught of ordinary killers like malaria, tuberculosis, and automobiles—it was not surprising that three deaths in the Forest Region did not warrant immediate intervention. But officials in Guéckédou organized their own small investigative team and dispatched it to Meliandou. Here, then, still in January, long before the outbreak took off, a team of doctors stood at ground zero, staring at some of the first casualties. They had no idea what they were looking at. The way Ebola kills would seem impossible to mistake. What the casual observer knows of Ebola are its most spectacular cases, or the cinematic depictions of them: prodigious bleeding from eyes, ears, nose, anus, and nipples. Symptoms like these, presenting all at once, would be impossible to miss or misinterpret. But not every Ebola case ends with such a biblical scourge, and many of Ebola’s symptoms are identical to those brought on by other diseases. Until its final stages, Ebola can easily be mistaken for cholera. It can also look a lot like malaria, another long-tenured killer in Guinea. What no one has ever died of anywhere close to Guinea is Ebola. The last big Ebola outbreaks—in Uganda and the Democratic Republic of the Congo in 2012—were more than 2,000 miles away. They might as well have been in another world. If you’d told any of the investigators, as they considered the crisis developing in Meliandou, that they were looking at Ebola, they either would not have believed you or, just as likely, would have asked you what Ebola was. BY JEFFREY E. STERNTHE PLAGUE A treatment center established by Doctors Without Borders in Guéckédou, Guinea, a town near the original source of the outbreak. On January 26, officials at the prefectural health authority held a meeting in Guéckédou. They now knew that something was wrong in Meliandou, but they didn’t know what. They consulted foreign health professionals stationed in town; Doctors Without Borders, or M.S.F. (for its French name, Médecins sans Frontières), had a malaria project there. Officials decided to make another visit to the village, this time with a more experienced medical team, on January 27. For a second time, health workers stood at the epicenter of the Ebola outbreak, and for a second time they did not understand what they saw. By now there had been eight Ebola infections and seven deaths. Meanwhile, the virus had slipped out of the village. When the grandmother of the infant victim fell sick, she decided that the way the villagers were approaching the illness—summoning a shaman to brandish his fetishes and work his spells—was not satisfactory. The grandmother had a friend in Guéckédou who was a nurse, and when the grandmother’s symptoms began to worsen, she went to see what real medicine could do for her. The nurse tried to help, but he had no idea what he was dealing with. The grandmother went back to Meliandou, where she died. In early February, the nurse himself developed a fever. Now the virus was in Guéckédou, a bustling trading hub where people converge from Liberia and Sierra Leone. When the nurse’s condition deteriorated, he sought help from a friend who was a doctor in Macenta, in the next prefecture over. The nurse stayed just one night in Macenta—sleeping in the doctor’s own house, sharing a room with the doctor’s own son—and died the next day, February 10, in the waiting room of the local hospital’s lab. The doctor in Macenta was shocked. He didn’t know what he had just witnessed, but it was unlike anything he had seen before, and he immediately sent an alert to the regional director of health in Nzérékoré. Then the doctor developed a fever. He set off for the capital, where he hoped someone might have answers. But along the road—a jolting, treacherous passage lined by burned-out cars and always a few freshly rolled tractor-trailers spilling timber—the doctor died. His body was sent to Kissidougou, a city of more than 100,000, where a funeral was held. Before long, Kissidougou was experiencing an outbreak of whatever it was that had killed the doctor. If the virus had failed in its first attempt to reach the capital, it was gaining momentum elsewhere, spreading through the forest and venturing dangerously close to international borders. At the hospital in Guéckédou, more and more people were showing up with vomiting and diarrhea. Looking at the nine cases of reported cholera in his wards, a doctor named Alexis Traore began to feel that the diagnosis might be wrong. The staff was highly sensitized to cholera—appropriately so, given the outbreaks they had endured—and the patients had telltale symptoms. But one symptom didn’t fit: the patients all had fevers. Fever generally isn’t associated with cholera. And Dr. Traore saw something else inconsistent with cholera: one of the patients was bleeding from the nose. Just as Traore began to challenge the diagnosis of cholera, his inquiry was foiled: tests the hospital had run for cholera came back, and seven of the nine were positive. The tests the hospital ran were cheap, easy to use, and highly sensitive; they are designed never to let a possible case elude detection. The downside: more than a few false positives. What this meant for Dr. Traore was that the working diagnosis had to remain unchanged: cholera. He notified his superiors in Nzérékoré. Nzérékoré had just received a report from Macenta, which was reeling from its own tragedy. The doctor who had fallen ill and died on the way to Conakry—he was just the beginning. Mysteriously, the doctor’s son had also died, and a colleague of the doctor’s who worked in the hospital lab, along with two of the doctor’s brothers and a nurse he had treated. Something was killing people in Macenta. Nzérékoré compiled a report on the two separate crises and sent it up to the capital. In Conakry, news of a doctor’s death was finally enough to register with the authorities. No one yet knew, but by now Ebola had claimed close to 30 lives and was continuing to spread—to Dandou Pombo, Dawa, Gbandou, Farako, and Baladou. The Ministry of Health and the country office of the World Health Organization set up a joint investigation, sending medical personnel to record the symptoms and backgrounds of patients who had died in Macenta. In the process, the team discovered that one of the victims—the nurse—didn’t live in Macenta but rather had come from Guéckédou. This was a crucial fact: the team began to suspect that the separate crises in Macenta and Guéckédou were not separate at all. Whatever was happening in the Forest Region, it was a single phenomenon. The team wrote up its findings and sent them back to the capital, where a few doctors began to suspect that the culprit wasn’t cholera or malaria—some even venturing that the disease might be a hemorrhagic fever. Here, nature threw one more curveball. Guinea, Sierra Leone, and Liberia have the world’s highest incidence of Lassa fever, a less lethal virus that can also produce hemorrhaging. So when a hemorrhagic fever was suspected, that is where the finger of evidence logically seemed to point—toward Lassa. Three and a half months into the outbreak, no one suspected Ebola. Collecting Samples What finally gave the virus away was, of all things, hiccups. On March 14, M.S.F.’s Geneva office received a report from a medical investigation in Guinea. M.S.F. Geneva immediately forwarded the report to Dr. Michel Van Herp, an epidemiologist in its Brussels office, and one of the world’s leading experts on Ebola. When Van Herp opened the document, what immediately jumped out at him was that half the victims had developed hiccups. For reasons not entirely clear to the medical community, hiccups are associated with Ebola. “It is definitely a hemorrhagic fever,” Van Herp told a colleague in Geneva, who was consulting with him by phone. “But we must really take into consideration that it is worse than Lassa. I think it’s Ebola.” Van Herp notified M.S.F.’s Brussels headquarters, presented his suspicions, and then immediately began preparing to leave for Africa. That same evening, working on the doctor’s hunch, M.S.F. initiated its response. A team on the ground in Sierra Leone was redirected across the border to Guinea with some basic equipment and protective gear. The team was prepared to deal with Lassa, so was not equipped for a sustained response to Ebola, but had enough to make do for the moment. A separate team was assembled in Brussels and made ready to travel. M.S.F. also needed to get blood samples to a lab capable of testing for Ebola and other exotic pathogens. To that end, a charter plane was dispatched from Conakry to an airstrip outside Guéckédou. Blood samples with suspected Ebola virus are categorized for transport by a special code, UN 2814, indicating “infectious substances, affecting humans,” and M.S.F. hired a specialty logistics operator to send the samples, which were packed according to a strict protocol, with three layers of protective and absorbent material. Then—because it was simply the fastest way—the samples from Guéckédou were loaded onto the daily Air France red-eye from Conakry to Paris. Nobody knew that, as the Air France flight left Conakry, the first infected person had already arrived in the capital—a trader with ties to the Forest Region. In a little more than a week, the virus carried by the trader would infect five other people. Within a month, the number would reach 47. In Paris, the samples were taken to the Institut Pasteur. But the institute reported a technical problem at the lab and had to move the samples to another facility, 250 miles away, in Lyon, where technicians were put on alert and told to wait up. Once the samples arrived, the technicians worked into the night. By a little after two A.M. on March 20, they had the first results: what they were looking at was a filovirus, meaning it couldn’t be Lassa. Later that day, at seven P.M., the worst was confirmed: the samples were positive for Ebola. The lab notified M.S.F., which notified its team on the ground and the government of Guinea. On March 22, more bad news came from the lab. The samples from Guinea were the Zaire strain, the deadliest known version of the virus.
Posted on: Fri, 07 Nov 2014 18:48:32 +0000
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