Today we know that the toxin responsible for atypical myopathy is a toxin present in the seeds of some Acer such as Acer pseudoplatanus (= maple tree; see (http://labos.ulg.ac.be/myopathie-atypique/the-disease/traduire-en-en_us-in-short/). With the current climatic conditions, maple seeds have begun to germinate. It is imperative to avoid that horses ingest [...]
It seems that the clinical series of atypical myopathy has ceased: the latest cases were declared two weeks ago.
Number of cases counted by country - updated 19/12/2014