As of 2006 it wasn't a requirement
per se, but we usually had a 15-30 minute video on some disability topic during recurrent. Screwing up operationally in this area can lead to some nasty publicity and, of course, a lawsuit - so this training is a really good idea. The FAA POI handling the carrier typically has a lot of input into initial and recurrent topics. If this person thinks it's a good idea, it'll be incorporated into the curriculum.
I was working for two different foreign carriers operating to the US in 2011 and 2012;
afaik no special training was given on this topic. The level of awareness, especially among cabin crews, was high, though, so perhaps none was needed.