This deadly [bad word] first emerged in the Middle East last year. So far, it's infected nearly 100 people, killing about half of them - and scientists have been striving to understand how it spreads.

Now tests have revealed that dromedary camels in Oman and the Canary Islands have signs of the [bad word] in their blood. Scientists have found antibodies that show that the animals were once infected with the Mers [bad word]  or one that's very similar.

This, though, doesn't offer definitive proof that camels are reservoirs for the disease. For that, scientists need to look at animals from the country where the [bad word] is most prevalent - Saudi Arabia - to see if they carry the infection. Researchers say confirming the source of the [bad word] is a priority and will be [bad word] for halting its spread.

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