A Plague on Pachyderms

At least seven species of herpesvirus commonly infect elephants. At zoos, keepers scramble to save calves, who are particularly vulnerable to the viruses.

Written byJef Akst
| 4 min read

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SICK SAMSON: The juvenile elephant on the right, Samson, nearly died from an endotheliotropic herpesvirus infection at Baltimore’s Maryland Zoo.THE MARYLAND ZOO IN BALTIMORE

In late February 2013, Mike McClure and the rest of the elephant team at the Maryland Zoo in Baltimore grew concerned about their calf, Samson. It was hard to pinpoint, but having raised the almost 5-year-old African elephant calf since birth, McClure knew something was wrong. “I looked at him and just noticed his behavior was off,” he recalls. Maryland Zoo head veterinarian Ellen Bronson agrees: “He was just very slightly not himself.”

The team sent blood samples out for analysis, and after a few inconclusive tests, a positive result confirmed their worst fears: Samson was infected with elephant endotheliotropic herpesvirus (EEHV), a virus commonly carried by adult elephants that can be deadly when acquired by a calf. “[The diagnosis] was devastating,” McClure recalls.

Researchers first discovered EEHV in 1995, after a 16-month-old Asian elephant calf named Kumari at the Smithsonian National Zoological Park in Washington, DC, suddenly fell ill and died in a matter of days. Zoo pathologists Laura Richman and Richard Montali performed a necropsy of the young elephant and found ...

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  • Jef (an unusual nickname for Jennifer) got her master’s degree from Indiana University in April 2009 studying the mating behavior of seahorses. After four years of diving off the Gulf Coast of Tampa and performing behavioral experiments at the Tennessee Aquarium in Chattanooga, she left research to pursue a career in science writing. As The Scientist's managing editor, Jef edited features and oversaw the production of the TS Digest and quarterly print magazine. In 2022, her feature on uterus transplantation earned first place in the trade category of the Awards for Excellence in Health Care Journalism. She is a member of the National Association of Science Writers.

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