Basically, several decades ago there was a disease in chickens called Marek’s disease. It had a low fatality rate, would kill a few percent of chickens. So they had the bright idea to vaccinate them, but they used a leaky vaccine - one that does not prevent the disease, merely reduces the symptoms of it.
Over the next few decades, the fatality rate of Marek’s disease creeped up to 100% in unvaccinated chickens, and near 0% in vaccinated chickens. But because it is a leaky vaccine, the vaccinated chickens can still spread it.
As a result, chickens that have been vaccinated for Marek’s disease cannot be kept with chickens that have not been vaccinated - the vaccinated ones tend to spread the disease and instantly infect non vaccinated chickens.
Look up Marek’s disease in Chickens.
Basically, several decades ago there was a disease in chickens called Marek’s disease. It had a low fatality rate, would kill a few percent of chickens. So they had the bright idea to vaccinate them, but they used a leaky vaccine - one that does not prevent the disease, merely reduces the symptoms of it.
Over the next few decades, the fatality rate of Marek’s disease creeped up to 100% in unvaccinated chickens, and near 0% in vaccinated chickens. But because it is a leaky vaccine, the vaccinated chickens can still spread it.
As a result, chickens that have been vaccinated for Marek’s disease cannot be kept with chickens that have not been vaccinated - the vaccinated ones tend to spread the disease and instantly infect non vaccinated chickens.
Pretty sure they are trying to start a human version or Marek's to kill off us non compliants....
Oh that's just great!