Which of the following best explains how the condition of a host can influence the success of a pathogen in causing disease?

• A. Pathogens are only successful in causing disease if the host is exposed to antibiotics.
• B. A weakened immune system in the host increases the likelihood of successful infection by the pathogen.
• C. The condition of the host has no impact on the ability of a pathogen to cause disease.
• D. A healthy host always prevents any pathogen from causing disease.

Answer: (B)

Verified step by step guidance

1. Understand the role of the host's immune system in defending against pathogens. The immune system acts as a barrier to infection by identifying and eliminating harmful microorganisms.
2. Recognize that a weakened immune system means the host's defenses are compromised, making it easier for pathogens to invade, multiply, and cause disease.
3. Consider that exposure to antibiotics does not directly determine the success of a pathogen; antibiotics are treatments rather than factors influencing initial infection success.
4. Acknowledge that the condition of the host, such as overall health and immune status, significantly impacts the ability of a pathogen to establish infection and cause disease.
5. Conclude that a healthy host has a stronger immune response, but it does not guarantee absolute prevention of disease, as some pathogens can overcome defenses under certain conditions.