Oregon Zoo's baby elephant Tula-Tu diagnosed with deadly herpesvirus, receiving treatment

Oregon Zoo's Asian elephant calf Tula-Tu is fighting EEHV, a virus that is a leading killer of young elephants in captivity.

Staff at the Oregon Zoo noticed subtle changes in Tula-Tu's behavior and energy levels on Oct. 24, prompting veterinarians to investigate — and the results confirmed one of the most feared diagnoses in elephant care. Testing at the Oregon Veterinary Diagnostic Laboratory at Oregon State University identified elephant endotheliotropic herpesvirus, known as EEHV, in the Asian elephant calf. The virus is considered a leading cause of death among young Asian elephants in captivity and can progress rapidly once symptoms appear. Veterinary teams have since launched a comprehensive treatment plan for Tula-Tu. One source described the strain detected as rapidly progressing, underscoring the urgency of the response. As of the latest reporting, Tula-Tu's condition is described as stable, and zoo doctors are expressing cautious optimism about her progress. EEHV is a herpesvirus that occurs naturally in elephant populations but can become life-threatening, particularly in young calves, when it enters the bloodstream and attacks the cardiovascular system. Early detection is considered critical to improving survival odds, and zoo staff's quick recognition of behavioral changes in Tula-Tu allowed veterinarians to begin intervention promptly.

Why it matters

EEHV is one of the most serious health threats facing Asian elephants in captivity and has killed numerous calves at zoos across North America and Europe. Tula-Tu's case highlights both the dangers of the virus and the importance of early behavioral monitoring in zoo animal care.

What's next

Veterinary staff are continuing Tula-Tu's treatment and monitoring her condition, with cautious optimism guiding their outlook.

Key facts

• Zoo staff first noticed changes in Tula-Tu's behavior and energy on October 24
• EEHV was confirmed through testing at the Oregon Veterinary Diagnostic Laboratory at Oregon State University
• One source described the detected strain as rapidly progressing
• Tula-Tu's condition is currently described as stable
• EEHV is a leading cause of death among young Asian elephants held in captivity
• Oregon Zoo veterinarians have launched a comprehensive treatment plan in response

Bias & framing notes

Both sources report the same core facts — the diagnosis, the Oct. 24 detection, and the treatment response — and agree on the stable prognosis and cautious optimism. KATU adds the detail that the strain is rapidly progressing, which KTVZ does not mention; it is unclear whether this reflects additional reporting or editorial framing. Neither source provides significant detail on the specific treatment being administered.

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