Marek's disease in chickens is caused by which type of pathogen?
Correct answer: D. A herpesvirus
- A. A birnavirus
- B. A retrovirus
- C. A poxvirus
- D. A herpesvirus
Explanation
Marek's disease is caused by an oncogenic herpesvirus of chickens, commonly called Marek's disease virus. Retroviruses cause diseases such as avian leukosis, while poxviruses cause fowl pox and birnaviruses cause infectious bursal disease.
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