Each year thousands of people from around the world tour the Gomantong Cave in Borneo. Although scientists have found a potentially dangerous virus in bats that roost in the cave, no one has ever gotten sick from a trip here. Razis Nasri hide caption

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Razis Nasri

The Next Pandemic Could Be Dripping On Your Head

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A woman is vaccinated at a health center in Conakry, Guinea, during the clinical trials of a vaccine against the Ebola virus. Cellou Binani /AFP/Getty Images hide caption

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Cellou Binani /AFP/Getty Images

First Ebola Vaccine Likely To Stop The Next Outbreak

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An Ebola burial team dons protective clothing before collecting the body of a woman who'd died from the virus in her home in a suburb of Monrovia, Liberia's capital. John Moore/Getty Images hide caption

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A Gang Killed A Guy With Ebola. Will They Agree To Be Quarantined?

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Emmie de Wit, who usually works in a Biosafety Level 4 Lab, spent time in less secure labs in Liberia during the Ebola outbreak in West Africa. Above, she prepares to test Ebola patient blood samples. Courtesy of NIAID hide caption

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Courtesy of NIAID

Omu Fahnbulleh stands over her husband after he staggered and fell, knocking him unconscious at an Ebola ward in Liberia in 2014. John Moore/Getty Images hide caption

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John Moore/Getty Images

Mutant Ebola May Have Caused Explosive Outbreak

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The mystery disease in South Sudan has not been identified but is known to cause fever and unexplained bleeding. Above: an image of another hemorrhagic fever, Marburg virus, made with an electron microscope and then colorized. BSIP/UIG/Getty Images hide caption

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BSIP/UIG/Getty Images

Margaret Chan (left), director general of the World Health Organization, is among the dignitaries visiting a military base in Conakry, Guinea, on a tour of west African countries affected by Ebola. Also pictured: Guinean President Alpha Conde (fourth from right) and U.N. Secretary General Ban Ki-Moon (right). BINANI/AFP/Getty Images hide caption

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BINANI/AFP/Getty Images

WHO Aims To Reform Itself But Health Experts Aren't Yet Impressed

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Maria Fabrizio for NPR

Scientists Say It's Time To End 'Parachute Research'

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Mamuedeh Kanneh (right) was married to the man who brought Ebola to Barkedu, Liberia, a village of about 6,000. He died of the virus. She now cares for her children as well as children who lost their parents to the disease. John W. Poole/NPR hide caption

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John W. Poole/NPR

The multimammate mouse can transmit Lassa virus to humans. The virus is likely spread when the rodent urinates or defecates on grain supplies. US National Library of Medicine, National Institutes of Health hide caption

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US National Library of Medicine, National Institutes of Health

Garmai Sumo is a nurse featured in the documentary, Body Team 12. In one scene, she shares her religious views: "When they die, the righteous will resurrect on the day of the trumpet. But everyone remain in their grave for now." Body Team 12 hide caption

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Body Team 12

A corpse has tested positive for the Ebola virus in Sierra Leone, a day after world health officials declared West Africa free of the disease. On Friday, people pass a banner reading "STOP EBOLA" — part of Sierra Leone's health campaign — in the city of Freetown. Aurelie Marrier d'Unienville/AP hide caption

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Aurelie Marrier d'Unienville/AP