What defines the presence of opportunistic infections in an individual with AIDS?

• A. Infections only affecting the respiratory system
• B. Infections that could occur with a normal immune system
• C. Infections commonly seen in AIDS patients
• D. Infections that are easily treated with antibiotics

Answer: (C)

The presence of opportunistic infections in an individual with AIDS is primarily defined by infections that are commonly seen in patients with this condition due to their severely compromised immune system. In individuals without AIDS, these infections are typically controlled by a healthy immune response. However, in those with AIDS, the weakened immune system allows for these otherwise benign microbes to cause serious illness.

Opportunistic infections, like Pneumocystis pneumonia or certain types of fungal infections, exploit the vulnerabilities of the immune system. This contrasts with other choices, as they do not address the specific nature of how these infections relate to the immunocompromised state of individuals with AIDS. For instance, while some infections might affect specific systems or could occur in those with a normal immune system, the defining characteristic of opportunistic infections in AIDS is that they are more prevalent and problematic in such immunocompromised individuals.