MERS

It's unknown what triggers an outbreak of Middle East respiratory syndrome. But scientists think the virus comes from camels. So until we stop it in animals, MERS will continue to cause trouble.

The government is trying to strike a balance between doing too little and doing too much to stop an outbreak of the deadly Middle East respiratory syndrome. But has it stepped over a line?

In the past week, cases of the Middle East respiratory syndrome have more than tripled in South Korea. Researchers now have a clue to why the outbreak has grown so large, so quickly.

Fears that Middle East respiratory syndrome could sweep through the region seem to be overblown. But researchers say there's still a lot they don't know about the potentially fatal virus.

The spread of the Middle East respiratory syndrome, or MERS, virus has sent sales of surgical masks soaring. Do they really help?

Additional confirmed cases of the Middle East respiratory syndrome, or MERS, have led to more than 200 school closures and a minor public panic in South Korea.

The U.S. government has stopped some experiments with dangerous viruses, saying the risks need to be reconsidered. Key work in one scientist's lab has been halted.