Flocked nasal swab versus nasopharyngeal aspirate for detection of respiratory tract viruses in immunocompromised adults: a matched comparative study

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Lars Öhrmalm^*, Michelle Wong, Maria Rotzén-Östlund, Oscar Norbeck, Kristina Broliden and Thomas Tolfvenstam

BMC Infectious Diseases 2010, 10:340 doi:10.1186/1471-2334-10-340

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