Colorado CNA Practice Exam

An opportunistic infection is an infection that occurs due to a weakened immune system. This makes option B the correct answer as individuals with weakened immune systems are more susceptible to these types of infections. Children under 5 years old typically have weaker immune systems as their immune system is still developing, making them more vulnerable to opportunistic infections. Marathon runners (option C) may have strong immune systems due to regular exercise and healthy lifestyles, therefore they are less likely to be affected by opportunistic infections. Option D, people with strong immune systems, would also be less likely to be affected by opportunistic infections as their immune system is able to fight off most infections.