Gary Hayward, a professor at Johns Hopkins School of Medicine who discovered elephant endotheliotropic herpes viruses and developed the DNA test used worldwide to detect the disease, clarifies misinformation about the virus in this letter to the editor. The disease is present in elephants around the world, most adults harbor the virus, only certain strains cause severe disease, and African elephant calves rarely develop the disease even though they are housed under similar conditions as Asian elephants, Hayward writes.

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