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Autopsy evidence of herpesvirus infection was found in visceral organs of four leukemic patients who had received large doses of cytarabine (cytosine arabinoside; Ara-C) shortly before their death.
 ( adverse event: found ,  four leukemic patients: Subject, four: Subject.Population, herpesvirus infection: Effect, large doses of cytarabine: Treatment, cytarabine (cytosine arabinoside; Ara-C): Treatment.Drug, leukemic: Treatment.Disorder) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: found ,  four leukemic patients: Subject, four: Subject.Population, herpesvirus infection: Effect, large doses of cytarabine: Treatment, cytarabine (cytosine arabinoside; Ara-C): Treatment.Drug, leukemic: Treatment.Disorder) 