1. How does the skin protect against infections? Give an example
of a situation when a breach in this barrier leads to infections.
Name an organism that breaches this line of defense.
2. A 10 year old girl is hospitalized with severe diarrhea and
abdominal cramping. Analysis of stool sample led to diagnosis of
Clostridium difficile as a cause of illness. Case history
revealed that the patient had recently completed a course of
Penicillin for ear infections. The last dose of Penicillin was
taken one week before the symptoms of diarrhea began. Explain how
use of Penicillin could have led to an infection with C.
3. Describe phagocytosis. How do phagocytes enter. the
site of infection during inflammatory response.
4. Paraplegic patients often have recurrent urinary tract
infections. Why would this infection keep coming back in spite of
5.The graph below shows the adaptive immune response when a body
is exposed twice to a specific foreign invader, such as influenza