Life Support - Tess Gerritsen

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The overnight er rotation at springer hospital suits dr. Toby harper just fine -- until its calm is shattered by a man toby admits one quiet night. Delirious and in critical condition from a possible viral infection of the brain, he barely responds to treatment...And then he disappears without a trace. But before toby can find her missing patient, a second case occurs, revealing a chilling twist: evidence of an infection that can only be spread through direct tissue exchange. Soon toby;s on a trail that winds from a pregnant sixteen-year-old prostitute to an unexpected tragedy in her own home. Only then does she discover the unthinkable: an evil, deadly design to the frightening epidemic.