An Asian elephant at Houston zoo in the US has received the first mRNA vaccine against herpes, which is the leading killer of Asian elephants calves in captivity.
Tess, a 40-year-old Asian elephant, was injected with the trial vaccine at the Texas zoo in June, after a spate of deaths in juveniles in zoos around the world from the elephant endotheliotropic herpesvirus (EEHV).
