Abstract
A minor viral population of oseltamivir-resistant A(H3N2) viruses (E119V neuraminidase mutation) was selected and maintained in a continually infected immunocompromised child following initial oseltamivir treatment. A subsequent course of oseltamivir given 7weeks later rapidly selected for the E119V variant resulting in a near-pure population of the resistant virus. The study highlights the challenges of oseltamivir treatment of immunocompromised patients that are continually shedding virus and demonstrates the ability of the E119V oseltamivir-resistant virus to be maintained for prolonged periods even in the absence of drug-selective pressure.
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