A Patient Shows the Presence of Antibodies Against Diphtheria Toxin

Multiple Choice

A patient shows the presence of antibodies against diphtheria toxin. Which of the following statements is FALSE?

A) A recent transfusion may have passively introduced the antibodies.
B) The patient may have had the disease and has recovered.
C) The patient may have the disease.
D) The patient may have been vaccinated.
E) The patient was near someone who had the disease.