American Society for Microbiology, Journal of Clinical Microbiology, 1(51), p. 356-359, 2013
DOI: 10.1128/jcm.02247-12
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ABSTRACT A neonate with herpes simplex virus 1 encephalitis was treated with intravenous acyclovir. During the course of therapy, the infection became intractable to the treatment and a mutation in the viral thymidine kinase gene (nucleotide G375T, amino acid Q125H) developed. This mutation was demonstrated in vitro to confer acyclovir resistance.