We haven't had any strangles, but daughter's trainer's herd did. She nearly lost her Arab filly to it - the abcess was putting too much pressure on the windpipe and she couldn't breath. Vet had to come out and lance it - thought they were going to have to trach her, but she got better once the abcess began to drain better and the swelling started going down.
We had dryland distemper hit our herd. Dryland distemper = pidgeon fever. Not nearly as serious as strangles, but it does cause abcesses - sometimes, as in our herd, multiple abcesses on the lower neck and chest.
There is absolutely nothing, other than good supportive care, that could be done for our bunch - keeping the abcesses open and draining was the big thing. We did spray the abcesses with blue kote to keep the flies away. It was awful watching them lose weight and just stand with their heads down, moping day after day. Eventually, they got better, though they looked like crap for a long time.
Plain Old Dee, horses Dancer and Rain I believe in dragons, unicorns, good men and other mythical creatures!