Marek’s disease is a viral epidemic disease that causes billions of dollars in economic loss in the poultry industry. It is caused by Gallid alphaherpesvirus 2 which transforms T lymphocytes into lymphomas. The infection of feather follicular epithelial cells starts the spreading of virus from chicken to chicken by shedding viral particles so when chickens flap their wings, the virus goes into the air and other chickens inhale the virus and become infected. Everything happens naturally and unseen, which is the beauty of microbiology.