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Antiviral treatment is available chiefly for infections caused by herpesviruses , and acyclovir ( aciclovir ) is the drug of choice for empirical therapy in suspected viral encephalitis .
 Chemical: acyclovir; Chemical: aciclovir
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: acyclovir; Chemical: aciclovir