Experts are stumped and “powerless” as three Asian elephants died in a month after a deadly virus swept through Zurich’s zoo. Experts said that they don’t know how to stop the spread of a virus.

What is herpesvirus? Experts 'powerless' as deadly virus stalks Zurich zoo, kills 3 Asian elephants

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What is herpesvirus? Experts 'powerless' as deadly virus stalks Zurich zoo, kills 3 Asian elephants