Which of the following can serve as a reservoir for infectious agents?

Infectious agents require a reservoir to thrive and multiply, which can be found in various forms. People can be carriers of infectious agents, either showing symptoms of an illness or being asymptomatic. The environment also plays a crucial role, as surfaces, water, and soil can harbor pathogens. Additionally, animals can transmit infections to humans and serve as reservoirs for diseases. Therefore, all the options listed are valid reservoirs for infectious agents, making the comprehensive answer the most accurate choice. Understanding the diverse reservoirs underscores the importance of infection control practices across different settings and populations.