› added 4 years ago

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TIL that Marek's disease affects chickens and was once rarely fatal. The introduction of a leaky vaccine (still get/spread virus, don't get sick) caused it to become 100% fatal. Because it is so fatal, and the vaccine doesn't stop the spread of the virus, Marek's can only spread in vaccinated flocks

Read more the-scientist.com

via reddit.com

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