What is the first link in the chain of infection?

• A. Reservoir
• B. Mode of transmission
• C. Portal of exit
• D. Susceptible host

Answer: (A)

Verified step by step guidance

1. Understand the concept of the chain of infection, which describes the process by which infections spread from one host to another.
2. Identify the components of the chain of infection: reservoir, portal of exit, mode of transmission, portal of entry, and susceptible host.
3. Recognize that the reservoir is the first link in the chain of infection. It is the place where the infectious agent lives, grows, and multiplies.
4. Consider examples of reservoirs, such as humans, animals, or the environment, where pathogens can thrive.
5. Reflect on the importance of controlling the reservoir to prevent the spread of infection, such as through sanitation, vaccination, or isolation.