Final answer:
Influenza is contagious and spreads through contact with respiratory secretions or inhalation of droplets. It can cause seasonal epidemics and pandemics.
Step-by-step explanation:
The correct statement about influenza is a. influenza is contagious.
Influenza, commonly known as the flu, is a contagious respiratory illness caused by influenza viruses. It spreads between humans through contact with respiratory secretions or inhalation of droplets or aerosols. Influenza can cause seasonal epidemics and even pandemics, which are epidemics that spread across large regions or worldwide.