Which of the following is the correct sequence for the chain of infection?

The sequence for the chain of infection is correctly outlined in the provided answer, which starts with the pathogen. This is the infectious agent, whether it's a bacterium, virus, fungus, or parasite, that initiates the infection process.

Following the pathogen, the next component in the chain is the reservoir. This refers to the natural habitat of the pathogen, where it lives and multiplies. These reservoirs can be either living organisms, such as humans or animals, or inanimate environments, such as soil or water.

The sequence continues with the portal of entry, which is the path through which the pathogen enters a new host. This can occur through various means, such as respiratory droplets, open wounds, or bodily fluids.

By understanding this sequence—starting with the pathogen and moving through the reservoir and then to the portal of entry—it becomes clear how infections spread and which points can be interrupted to control and prevent disease transmission. Recognizing this chain is crucial for implementing effective infection control measures.