MS-2414

A 16-year-old boy visits his doctor with a complaint of dark brown urine for the past 2 days. He mentions feeling unwell for the past week with a fever and a sore throat. The doctor conducts a urinalysis and finds the following results:

– Glucose: Negative
– Ketones: Negative
– Blood: Positive
– Protein: Negative
– Leucocytes: Negative
– Nitrites: Negative

The doctor explains to the patient that he likely had an upper respiratory tract infection last week. The most commonly produced immunoglobulin in his body has combined with infection cells and deposited in his kidneys, causing blood in his urine.

What type of immunoglobulin is responsible for this patient’s condition, based on the given information?