A 5-year-old boy comes to opd complaints of recurrent nosebleeds. He had a sore throat and a runny nose 3 weeks ago. Examination shows multiple petechiae scattered over the trunk and back. Laboratory studies show a platelet count of 14,000/mm3. Which of the following is the most likely underlying cause of this patient's condition?
Antibodies against streptococcal M protein
Antibodies against ADAMTS13
Antibodies against phospholipase A2 receptor
Antibodies against Gpllb/Illa
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