Human Herpesvirus Kills Four Lemurs, One After ‘Lemur Yoga’ Session

A recent study confirms that a human herpesvirus (HSV‑1) infected and killed ↓ 4 captive lemurs in the United States, including an animal that participated in a “lemur yoga” class.

Human herpesvirus transmission to lemurs raises alarm

The virus, ubiquitous in humans and usually limited to cold sores, proved lethal when it crossed species, causing encephalitis and rapid death. Researchers at the University of Florida’s College of Veterinary Medicine identified HSV‑1 DNA in brain tissue using PCR, marking the first molecular confirmation of the pathogen in lemurs.

Case details

Two ring‑tailed lemurs (Lemur catta), one black‑and‑white ruffed lemur (Varecia variegata) and a hybrid ruffed lemur were privately owned and had frequent close contact with people. One of them performed yoga alongside participants, a scenario the lead author describes as “not good for the lemurs.”

“When HSV‑1 jumps into a new host, the outcome can be catastrophic,” said Dr. Jim Wellehan, co‑author of the study.

Symptoms ranged from lethargy and loss of appetite to seizures and respiratory distress. Post‑mortem examinations revealed inflamed brain tissue, intranuclear inclusions and viral proteins, confirming HSV‑1 as the cause. Earlier oral swabs from two animals tested positive while alive, suggesting that early diagnostic sampling could avert fatal outcomes. Human‑to‑primate spillover events remain rare, but the episode underscores the need for stringent biosecurity in private collections and exotic‑pet settings. Similar fatalities have been recorded in marmosets, gibbons and other primates, according to Reuters and AP News. The authors warn that casual, saliva‑based contact—kissing, sharing food or close‑up interactions—provides a pathway for the virus. While accredited zoos enforce strict barriers, private owners often lack such safeguards. The study calls for heightened awareness among exotic‑pet enthusiasts and a reevaluation of activities that bring humans into intimate proximity with vulnerable wildlife. Correction: An earlier dispatch misstated the study’s publication month; it was released in July, not June.