Seventy-two tigers have died at two tourist parks in Chiang Mai province, Thailand, between February 8th and 18th.
Officials have identified canine distemper virus (CDV) as the cause, a virus that does not affect humans. The deaths had initially sparked fears of an avian flu outbreak, which Thai authorities have dismissed.
While autopsies confirmed CDV and traces of bacterial infection, the exact origin of the infections remains under investigation. Veterinarians are exploring the possibility that contaminated food from a common source could be responsible, given the parks' proximity.
Public health officials stated there have been no animal-to-human infection cases. However, monitoring of individuals who had recent contact with the tigers is ongoing. Both parks, operating under the name Tiger Kingdom, are currently closed.
CDV is known to affect dogs and felines, potentially causing severe symptoms in tigers. The virus can spread through bodily fluids and the air.
Authorities noted that tigers in confined environments may be particularly susceptible to viral infections, especially when combined with stress and inbreeding conditions. The remains of the deceased tigers have been cremated and buried.