A 5-year-old male is diagnosed with immune thrombocytic purpura (ITP). What is the most common cause of this condition?
a. Normal postnatal platelet lysis
b. Virally induced antibody destruction of platelets
c. An allergic reaction to vaccinations
d. Maternal antibodies that target platelets in the neonate
ANS: B
In approximately 70% of cases of ITP, there is an antecedent viral disease. ITP is not associated with postnatal platelet lysis, an allergic reaction, or contact with maternal antibodies.
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