Problem
A. A person needs an emergency blood transfusion, but there is no time to determine their blood type via an agglutination test. Which type of donor blood should be used from the hospital blood bank, and why? Be specific in regards to both ABO and Rh-factor blood groups.
B. What would happen immunologically if a patient received a blood transfusion from a donor with an incompatible ABO or Rh blood group?
C. Explain in detail how a Clostridium difficile infection occurs.
D. Why is Clostridium difficile considered to be an "opportunistic pathogen"?