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Borna disease was named after a city in eastern Germany where it once killed numerous horses in the late 19th century.

“This Borna disease is really a strange disease—it’s not like a flu,” he adds, noting that it does not cause epidemics.

Borna disease virus 1, or BoDV-1, is normally found in horses, sheep and other mammals.

They found evidence of Borna disease virus in eight samples.

The infectious agent responsible, Borna disease virus 1—named for an outbreak in military horses in the German city of Borna in the 19th century—causes encephalitis, an inflammation in the brain.