55.  A patient presents with symptoms consistent with gumm…

  55.  A patient presents with symptoms consistent with gummas on many organs, skin                    bone, neurosyphylis and cardiovascular aortic aneurism.  These symptoms and                    signs are consistent with:                  

50. Several hours after a picnic to celebrate the end of mic…

50. Several hours after a picnic to celebrate the end of microbiology class, some            of the students began to experience nausea, vomiting and abdominal pain which            lasted for about 24 hours.  A culture from the picnic food grows gram + aerobic            endospore forming rods.  The most likely etiology of the food poisoning is:  

36. A 34-year-old man sustained a gun-shot wound in the leg….

36. A 34-year-old man sustained a gun-shot wound in the leg.  When hospitalized,             he developed a severe infection in the lower leg with gas formation in the             deep tissues.  Which of the following is the most likely pathogen?