Receiving an influenza vaccine affects which link in the chain of infection?

Receiving an influenza vaccine primarily affects the susceptible host link in the chain of infection. Vaccination enhances the immune system’s ability to fight off infections caused by the influenza virus. By bolstering the body's defenses, the vaccine reduces the likelihood that an individual will contract the virus, effectively making that person less susceptible to infection.

This intervention is a proactive measure to develop immunity to the pathogen, thus reducing the overall pool of individuals who can become infected and subsequently transmit the virus to others. The primary intent of vaccination is to protect individuals from becoming ill, which directly relates to their status as a susceptible host in the context of infection prevention.