https://www.morningagclips.com/mareks-disease-how-does-a-deadly-chicken-virus-escape-vaccines-designed-to-slow-it/
Marek’s Disease: How Does a Deadly Chicken Virus Escape Vaccines Designed to Slow It? - Morning Ag...
Explore how Marek's Disease spreads among chickens and the research identifying genetic factors behind its increased virulence.