LAUSR

Abstract Background: Viral associated diarrhea (VAD) due to Norovirus (NV), Rotavirus (RV) and Adenovirus (AV) is common in immunocompromised and cancer patients. We sought to determine if the clinical characteristics, morbidity and seasonality of infection differed according to the type of enteric virus identified. Methods: Cases of NV, RV and AV were identified in stool specimens submitted to the clinical microbiology laboratory between November 2005 and February 2015. Clinical characteristics of patients, potential risk factors and outcomes were compared. Results: A total of 97 VAD cases were identified: NV (n = 49), RV (n = 34) and AV (n = 14). The majority of cases were in patients with leukemia and lymphoma. NV (59%), RV (74%) and AV (78%) were identified in hematopoietic stem cell transplant (HSCT) recipients; and in patients with graft versus host disease (GVHD): NV (34%), RV (46%) and AV (57%). Nine cases of NV were genotyped; all were due to genotype II. Nine of 49 (18%) cases of NV, 7 of 34 (20%) cases of RV and 2 of 14 (14%) cases of AV were considered to be health care acquired (HCA). In multivariate analysis, immunosuppression (OR 2.8 95% CI 1.26-6.60, p = .01) and neutropenia (OR 4.8 95% CI 1.27-18.5, p = .01) were identified as risk factors for NV diarrhea compared to RV and AV. Conclusions: In our study, agents responsible for VAD occurred year round but predominated in the winter time; caused prolonged illness and were frequently health care associated. Presentations were atypical in many cases without upper gastrointestinal symptoms such as nausea and vomiting.