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 MERS, a serious respiratory illness caused by a virus known as a
coronavirus (CoV), has infected at least 850 people since it first
emerged two years ago and killed at least 327 of them, according to
latest figures from the European Centre for Disease Prevention and
Control (ECDC).
The vast majority of human cases have been in Saudi Arabia, but
isolated MERS cases have been reported across Europe and in Asia and
the United States in people linked who have recently traveled in the
Middle East.
Scientists are not sure of the origin of the virus, but several
studies have linked it to camels and some experts think it is being
passed to humans through close physical contact or through the
consumption of camel meat or camel milk.
However, in this latest study, published in the online journal of
the American Society for Microbiology mBio, scientists said the
detection of the virus in air samples was concerning and needed to
be followed up.
"The clear message here is that detection of airborne MERS-CoV
molecules, which were 100 percent identical with the viral genomic
sequence detected from a camel actively shedding the virus in the
same barn on the same day, warrants further investigations and
measures to prevent possible airborne transmission of this deadly
virus," said Esam Azhar, an associate professor of medical virology
at King Abdulaziz University in Jeddah who led the study.
Viruses that spread through air - such as flu viruses for example -
are far more likely to spread swiftly and widely in human
populations than those that can only move from an animal to a
person, or from person to person, via direct contact.
For their research, Azhar's team collected three air samples on
three consecutive days from a camel barn near Jeddah owned by a
43-year-old male MERS patient who later died from the disease.
Four of the man's nine camels had shown signs of nasal discharge the
week before the patient became ill, and he had applied a topical
medicine in the nose of one of the sick camels a week before
experiencing symptoms.
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Using a laboratory technique called reverse transcription polymerase
chain reaction (RT-PCR) to detect levels of particular genes, the
scientists found that the first air sample, collected on Nov. 7,
2013, contained genetic fragments of the MERS virus.
This was the same day that one of the patient's camels tested
positive for the disease, they explained in a report of their work.
The other samples did not test positive for the MERS virus -
suggesting short or intermittent shedding of the virus into the air
surrounding the camels, Azhar said.
Further tests of the first air sample confirmed the presence of MERS
genetic sequences and showed that the fragments were identical to
fragments detected in the camel and its sick owner.
"This study also underscores the importance of obtaining a detailed
clinical history with particular emphasis on any animal exposure for
any MERS case, especially because recent reports suggest higher risk
of (MERS) infections among people working with camels," Azhar said.
The World Health Organisation and the Saudi Health Ministry have
advised camel farm and slaughterhouse workers to take precautions
against MERS by ensuring good hygiene, including frequent hand
washing after touching animals, facial protection where feasible,
and wearing of protective clothing.
(Reporting by Kate Kelland, editing by Ken Wills)
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