Which of the following is the correct order for the cycle of infection components?

• A. Portal of entry, Susceptible host, Portal of exit, Transmission of disease
• B. Portal of exit, Transmission of disease, Susceptible host, Portal of entry
• C. Portal of exit, Susceptible host, Portal of entry, Transmission of disease
• D. Susceptible host, Portal of exit, Portal of entry, Transmission of disease

Answer: (C)

The correct order for the cycle of infection components involves understanding how an infection is transmitted. The sequence begins with the portal of exit, which is the path through which pathogens leave the infected host. Following this, transmission occurs, where the infectious agent is spread to a new host. The next component is the susceptible host, which is an individual who is at risk of becoming infected. Lastly, the portal of entry is the route through which the pathogen enters the new host, thus completing the cycle.

In this context, the cycle starts at the site of exit from the original host. Following that, the pathogen must find a means to transmit itself, whether through direct contact, airborne transmission, or another route. Once it reaches a susceptible host, it can then enter the body through a specific portal. Understanding this sequence is crucial in implementing infection control measures effectively.

The other sequences do not accurately reflect the correct cycle as they either start at the wrong point or misplace the components in relation to each other. The focus must remain on the logical progression of how infections are spread and established within hosts.