University revision · Parasitology

Human African Trypanosomiasis

Question 1 of 36 Course: Biomedical Science(Degree)

What is the primary ecological difference between the transmission cycles of T. b. gambiense and T. b. rhodesiense?

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In a true emergency for a patient with a previously confirmed ABO/Rh type on record, the safest and most responsible action is to use group O Rh-negative (or Rh-positive per hospital policy) red blood cells until a new sample can be drawn and tested. Issuing type-specific blood based solely on an old record without a current sample is extremely risky because: 1) The old record could be wrong or belong to a different patient with a similar name. 2) The patient may have developed a new, clinically significant antibody since the last test. Drawing a 'current sample' from the patient in the emergency setting is possible and should be done immediately, but testing it takes time. O-negative blood can be issued instantly, providing life-saving oxygen-carrying capacity while the current sample is processed to confirm the type and screen. This balances speed with safety.

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