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Gorilla susceptibility to Ebola virus: the cost of sociality

By monitoring a large population of gorillas during an Ebola outbreak in the rain forest of the Republic of the Congo, researchers have found that in a few months the virus exhibited dramatic--but disproportionate--impacts on group-dwelling and solitary gorillas. The findings offer a unique glimpse into the factors affecting the threat the deadly virus poses to great apes.

The work is reported in the July 12th issue of the journal Current Biology by a team of researchers including Damien Caillaud and colleagues from the University of Montpellier and the University of Rennes, France.

Ebola virus is extremely lethal for humans and other great apes. Since 1994, the Zaïre subtype of the Ebola filovirus has been responsible for nine human outbreaks in Gabon and the Republic of the Congo; a majority of these outbreaks have originated from the handling of infected great-ape carcasses. In fact, Ebola virus has become one of the major threats to the survival of western lowland gorillas (Gorilla gorilla gorilla) and chimpanzees (Pan troglodytes troglodytes) in this region. However, the causes of outbreak among wild animals, and the way the virus spreads, remain unclear. It has been argued that the infection of apes only occurs by way of the so-called "reservoir" species (unknown, but possibly fruit bats), with ape-to-ape transmission playing only a minor role due to an insufficient rate of encounters between groups.

In the new work, the researchers studied the spread of Ebola virus in a gorilla population of Odzala-Kokoua National Park, Republic of the Congo. Social units--defined as groups and solitary males--composing this population regularly visited a forest clearing where they were studied from 2001. In all, around 400 gorillas were identified from their individual morphological characteristics. Ebola virus affected this population in 2004. During and after the outbreak, the researchers used the data on the identity of animals previously observe
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Source:Cell Press


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