Researchers yesterday pointed to the Arabian camel as a possible host of the deadly human MERS virus plaguing the Middle East.
The exact origins of the virus is a riddle scientists have been working hard to solve in a bid to halt its spread, especially in the lead-up to the annual hajj pilgrimage to Saudi Arabia in October.
Now an international team says blood tests were positive for antibodies in camels from Oman, meaning they had at some point been infected with Middle East Respiratory Syndrome Coronavirus (MERS-CoV), or a closely related virus.
Photo: AFP
The findings suggest that Arabian or dromedary camels “may be one reservoir of the virus that is causing MERS in humans,” said a statement that accompanied the study published in The Lancet Infectious Diseases journal.
Scientists had long suspected that like its cousin virus SARS, which killed hundreds of people in Asia 10 years ago, MERS may originate in bats.
However, it is unlikely that these shy, nocturnal creatures are passing the virus on to humans, and the involvement of an intermediary “reservoir” animal is suspected — with anecdotal evidence of patients having been in contact with camels or goats.
For the study, the team took blood from 50 camels from across Oman and another 105 in the Canary Islands, as well as llamas, alpacas, Bactrian camels, cattle, goats and sheep from the Netherlands, Chile and Spain.
They found MERS-like antibodies in all of the Omani camels and lower levels in 15 of those from the Canary Islands.
“What it means is that these camels some time ago have come across a virus that is very similar to MERS-CoV,” said the paper’s senior author Marion Koopmans of the Netherlands’ National Institute of Public Health and the Environment.
According to the study, the Oman samples came from various locations in the country, “suggesting that MERS-CoV, or a very similar virus, is circulating widely in dromedary camels in the region.”
Dromedary camels are popular animals in the Middle East and North Africa, used for transport, meat and milk, as well as racing. There are an estimated 13 million of them in the world today — all but a few domesticated.
A respiratory virus that causes fever and pneumonia, MERS has claimed lives in Jordan, Qatar, the United Arab Emirates, Saudi Arabia, France, Germany, Italy, the UK and Tunisia.
All people who had fallen ill outside the Arabian peninsula had either visited one of the Middle Eastern countries or had been infected by a person thought to have come from there.
“This looks like the big break that public health workers needed in the fight against the spread of MERS,” University of Reading microbiologist Benjamin Neuman said. “This is the first hard evidence that camels may be the missing link in the chain of transmission.”
Koopmans said the findings had by no means solved the puzzle, but were an important pointer for further research.
“Camels indeed are very important for the region, an important source of food, transportation and fun [racing], and we should certainly not jump to conclusions,” she said.
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