Well hopefully they have closed the yard, in which case you shouldn't have anything to worry about - it's not carried on the wind, it requires contact between horses or indirectly on substances like fences and water troughs.
The main danger would be if any affected horse (even if it isn't showing signs) is still going out to shows in your vicinity.
It's always worth being vigilant for glandular swellings and a raised temperature.
Strangles is only passed on through direct contact. So either your horse has to touch a horse that is carrying the bacteria, or you need to touch the horse then touch your own.
It can also be passed through sharing equipment like buckets and lives in water & wood for quite a while.
So if neither you, nor anyone/any horse on your yard has been near an infected horse then it is extreamly unlikely.
The yard concerned should now be in quarantine. No horse should be allowed on or off that yard until the last infected horse is given the all clear.
My horse has strangles atm, I am on a large yard with about 50 horses. Only 6 have been infected, none of the neighbouring yards have been infected and we have 1 right over the road and another a 5 min walk away.
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How is your ned? ( I know you've posted but am too lazy to trawl through posts.)
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Hes getting there. He developed a serious complication purpura haemorrhagica, have just posted update in NL. 3rd abcess now burst, waiting for it to drain then hopefully he can come off steroids and antibiotics
Vet is very hopefull he will recover fully, but there is a small chance he wont.