AHS continues to spread across Thailand, more than 500 horses are now reported dead (2020-05-13 update).
The Horse.com article - As African horse sickness (AHS) continues to spread across Thailand, horse owners seek vaccines and Cambodia works to protect horses on its Thai border...
OIE report and stats
AHS is a highly infectious and almost invariably fatal equine disease transmitted by insect vector (biting midges) between ALL Equidae, e.g. horses, donkeys, mules, zebras.