Within a period of days, more than 45 teenagers in a small r…

Within a period of days, more than 45 teenagers in a small rural town were diagnosed with hemorrhagic colitis. Unfortunately, another 50 patients contracted the disease, 2 of which developed hemolytic uremic syndrome, before epidemiologists were able to identify the source of infection, a contaminated batch of ground beef at the local hamburger joint. Which microbe was most likely the causative agent of this outbreak?

A 56-year-old African American female presents to the emerge…

A 56-year-old African American female presents to the emergency room for evaluation of her hip following a fall in her shower. Her past medical history is notable for kidney stones and constipation as well as recent fatigue and weakness. What electrolyte imbalance might have led to her susceptibility to broken bones?