A. Vaccine
B. Fungus
C. Virus
D. Bacteria
🧠 Explanation:
H5N1 is a virus, specifically a subtype of influenza A, known as avian flu. First identified in birds, it can occasionally infect humans, causing severe respiratory illness. Highly contagious among poultry, it poses risks to agriculture and public health. Its potential for mutation raises concerns about pandemics, prompting global monitoring. Understanding H5N1 is crucial for virology, public health strategies, and biosecurity. Research focuses on vaccines and containment to prevent outbreaks. The virus’s impact on both animal and human populations underscores the importance of surveillance in managing infectious diseases.