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Jun 11, 2019 · The last link in the chain of infection is the susceptible host. How susceptible any host will be, depends on a variety of factors: Their age – and in particular if they are very young or very old; Whether there is any presence of malnutrition or dehydration; Whether there is any underlying chronic disease; If the host suffers from immobility
The links in the chain of infection include Infectious Agent, Reservoir, Portal of Exit, Mode of Transmission, Portal of Entry, and Susceptible Host [2]: Infectious Agent : Microorganisms, such as bacteria, viruses, fungi, or parasites, that can cause infectious disease.
Dec 7, 2023 · The final link in the chain of infection is the susceptible host, who is an individual that is vulnerable to the pathogen. This includes individuals with weakened immune systems, as well as those who consume contaminated food or water.
- Reservoir. The reservoir of an infectious agent is the habitat in which the agent normally lives, grows, and multiplies. Reservoirs include humans, animals, and the environment.
- Portal of exit. Portal of exit is the path by which a pathogen leaves its host. The portal of exit usually corresponds to the site where the pathogen is localized.
- Modes of transmission. An infectious agent may be transmitted from its natural reservoir to a susceptible host in different ways. There are different classifications for modes of transmission.
- Portal of entry. The portal of entry refers to the manner in which a pathogen enters a susceptible host. The portal of entry must provide access to tissues in which the pathogen can multiply or a toxin can act.
The Infection Cycle. In order for an infection to spread from one individual to another and cause disease, six specific phases must occur. This process is known as the chain of infection, and it only results in infection if all six links of the chain are present and intact (Figure 6.2).
The chain of components has six sections. They include: Microorganisms: Disease producing, also called pathogens. Virus, parasite, fungus, bacterium. Risk factors: Virulence, pathogenicity, ability to enter host. Reservoir/Source: Environment/habitat where a pathogen can live and multiply.
Dec 7, 2023 · When an infection is transmitted from one person to another, it follows a specific order or sequence. This is referred to as the infection chain order. The chain consists of multiple links, starting from the source of the infection and ending with the susceptible individual.
