Oregon Certified Nursing Assistant State Practice Exam

What link in the chain of infection is affected when an NA gets vaccinated for hepatitis B?

1. A. Reservoir (place where the pathogen lives and grows)

2. B. Mode of transmission (a way for the disease to spread)

3. C. Susceptible host (person who is likely to get the disease)

4. D. Portal of entry (body opening that allows pathogens to enter)

The correct answer is: C. Susceptible host (person who is likely to get the disease)

When a nursing assistant (NA) gets vaccinated for hepatitis B, it directly impacts the susceptible host link in the chain of infection. The primary purpose of vaccination is to bolster the immune system against specific pathogens, in this case, the hepatitis B virus. By receiving the vaccine, the NA increases their immunity and reduces their susceptibility to the infection, thereby minimizing the risk of becoming ill. In the chain of infection, the susceptible host is an individual who is vulnerable to contracting the disease due to factors such as weakened immunity or lack of prior exposure. Vaccination works to enhance the body's defenses and offers protection against certain pathogens, effectively reducing the number of susceptible hosts in the environment. Increasing immunity among healthcare workers helps prevent the spread of infections in healthcare settings. The other components of the chain, like reservoir, mode of transmission, and portal of entry, remain unaffected by the vaccination itself. Vaccination does not eliminate the presence of the virus in reservoirs or alter how the virus is transmitted, nor does it change how it enters the body. It solely focuses on enhancing the host's ability to resist infection.