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Believe it or not, I had the same incident which my two spitzhauben pullets and two Welsummer pullets died from Marek's and they were vaccinated. Was not too happy about it. They got it from the wild birds that came and went and used the coop all winter, had to chase them out every darn morning and before I know it, I was losing birds. Finally all is settled, everyone is immune to it. Every bird I get from the hatchery must be immunized and the ones I've hatched out, its a gamble.
When I spoke to the veterinarian about this yesterday, he said about 9 or 10 years ago, a new strain of Marek's showed up. They had to adjust the vaccine to account for the new strain. Don't know when this happened to you, but maybe this explains it.
Believe it or not, I had the same incident which my two spitzhauben pullets and two Welsummer pullets died from Marek's and they were vaccinated. Was not too happy about it. They got it from the wild birds that came and went and used the coop all winter, had to chase them out every darn morning and before I know it, I was losing birds. Finally all is settled, everyone is immune to it. Every bird I get from the hatchery must be immunized and the ones I've hatched out, its a gamble.
When I spoke to the veterinarian about this yesterday, he said about 9 or 10 years ago, a new strain of Marek's showed up. They had to adjust the vaccine to account for the new strain. Don't know when this happened to you, but maybe this explains it.