Diagnostic determination of Norovirus infection as one of the major causes of infectious diarrhea in HIV patients using a multiplex polymerase chain reaction assay

Abstract

Although infectious diarrhea is one of the most common complications in human immunodeficiency virus (HIV)-infected patients, robust diagnostic methods for determining potential pathogens are still limited in the clinic. Norovirus, a type of calicivirus, has been shown to be the most common cause of gastroenteritis. Here, we used multiplex polymerase chain reaction as a diagnostic tool to verify Norovirus as the diarrhea-related pathogen in HIV-infected patients with unknown etiological information. Stool specimens obtained from 81 HIV-infected patients with diarrhea were analyzed by BioFire FilmArray Gastrointestinal (GI) panel. Among 26 HIV-infected patients with unknown etiological information, we detected Norovirus in 14 stool specimens of these patients with 100% sensitivity and specificity as confirmed by reverse transcription polymerase chain reaction (RT-PCR), and one specimen showed both Norovirus and enterotoxigenic Escherichia coli infection. Among the remaining 55 patients with verified Clostridium difficile infection, nine patients also detected positive for Norovirus infection. In conclusion, using FilmArray GI panel and RT-PCR, we determined that Norovirus infection as one of the main pathogens responsible for diarrhea in HIV patients.

Keywords

HIV/AIDS diarrhea automated nested multiplex polymerase chain reaction system diagnostics

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