某地区防疫站,近日收到大量急性黄疸型肝炎的疫情报告,为查明本次肝炎的流行病学特征,患者应查哪项血清学检查以明确病原诊断?( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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