Virology<unk>  coronaviruses under electron microscope Middle East respiratory syndrome is caused by the<unk>  coronavirus <unk> -CoV), a species with single-stranded RNA belonging to the genus betacoronavirus which is distinct from SARS coronavirus and the common-cold coronavirus. Its genomes are phylogenetically classified into two clades, Clades A and B. Early cases of<unk>  were of Clade A clusters (EMC/2012 and Jordan-N3/2012) while new cases are genetically different in general (Clade B). The virus grows readily on Vero cells and LLC-MK2 cells. In November 2012, Egyptian virologist Dr. Ali Zaki sent a virus sample from the first confirmed case in Saudi Arabia to virologist Ron Fouchier, a leading coronavirus researcher at the Erasmus Medical Center (EMC) in Rotterdam, the Netherlands. The second laboratory-proven case was in London, confirmed by the UK Health Protection Agency (HPA). The HPA named the virus the London1_novel CoV 2012. Transmission Camels A study performed between 2010 and 2013, in which the incidence of<unk>  was evaluated in 310 dromedary camels, revealed high titers of neutralizing antibodies to<unk> -CoV in the blood serum of these animals. A further study sequenced<unk> -CoV from nasal swabs of dromedary camels in Saudi Arabia and found they had sequences identical to previously sequenced human isolates. Some individual camels were also found to have more than one genomic variant in their nasopharynx. There is also a report of a Saudi Arabian man who became ill seven days after applying topical medicine to the noses of several sick camels and later he and one of the camels were found to have identical strains of<unk> -CoV. It is still unclear how the virus is transmitted from camels to humans. The World Health Organization advises avoiding contact with camels and to eat only fully cooked camel meat, pasteurized camel milk, and to avoid drinking camel urine. The Saudi Ministry of Agriculture has advised people to avoid contact with camels or wear breathing masks when around them. In response "some people have refused to listen to the government's advice" and kiss their camels in defiance of their government's advice. Between people There has been evidence of limited, but not sustained spread of<unk> -CoV from person to person, both in households as well as in health care settings like hospitals. Most transmission has occurred "in the circumstances of close contact with severely ill persons in healthcare or household settings" and there is no evidence of transmission from asymptomatic cases. Cluster sizes have ranged from 1 to 26 people, with an average of 2.7.
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