男性,15岁,头晕、乏力、全身疼痛,伴发热、皮肤紫癜半月余。查体:贫血貌,体温38.5℃,心肺(一),胸骨压痛(+),肝肋下0.5cm,脾肋下0.5cm。该患者发热的原因可能是()。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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