Hebah A Al Khatib1, Peter V Coyle2, Muna A Al Maslamani3, Asmaa A Al Thani4, Sameer A Pathan5, Hadi M Yassine6. 1. Biomedical Research Center, Qatar University, Doha 2713, Qatar. Electronic address: h.alkhatib@qu.edu.qa. 2. Virology Laboratory, Hamad Medical Corporation, Doha 3050, Qatar. Electronic address: PCoyle@hamad.qa. 3. Communicable Diseases Center, Hamad Medical Corporation, Doha 3050, Qatar. Electronic address: malmaslamani@hamad.qa. 4. Biomedical Research Center, Qatar University, Doha 2713, Qatar; Department of Biomedical Sciences, College of Health Sciences-QU Health, Qatar University, Doha 2713, Qatar. Electronic address: aaja@qu.edu.qa. 5. Emergency Medicine, Hamad Medical Corporation, Doha 3050, Qatar. 6. Biomedical Research Center, Qatar University, Doha 2713, Qatar; Department of Biomedical Sciences, College of Health Sciences-QU Health, Qatar University, Doha 2713, Qatar. Electronic address: hyassine@qu.edu.qa.
Abstract
Human influenza viruses are occasionally detected in the stools of influenza patients. OBJECTIVES: Here, we investigated the molecular and biological characteristics of intestinal influenza viruses and their potential role in virus transmission. METHODS: Fecal samples were first screened for the presence of influenza viral RNA using RT-qPCR. Positive fecal samples were subjected to cell culture. Isolated viruses were then sequenced using MiSeq platform. Replication kinetics and receptor binding affinity were also evaluated. RESULTS: Influenza RNA was detected in stool samples of 41% (36/87) of influenza A positive patients. Among the 36 stool samples subjected to viral isolation, 5 showed virus growth. Sequence analysis of isolated viruses revealed two distinct mutation patterns in fecal viruses. Set I viruses was able to replicate to higher titers in cell culture despite the limited number of mutations (6 mutations) compared to set II viruses (>10 mutations). Functional analysis of both sets revealed the ability to replicate efficiently in differentiated human bronchial cells. Receptor binding testing has also demonstrated their ability to bind α 2,3 and α 2,6 sialic acid receptors. CONCLUSION: The ability of fecal influenza viruses to replicate in intestinal cells and human 3D bronchial cells might suggest their possible contribution in virus transmission.
Human influenza viruses are occasionally detected in the stools of influenza patients. OBJECTIVES: Here, we investigated the molecular and biological characteristics of intestinal influenza viruses and their potential role in virus transmission. METHODS: Fecal samples were first screened for the presence of influenza viral RNA using RT-qPCR. Positive fecal samples were subjected to cell culture. Isolated viruses were then sequenced using MiSeq platform. Replication kinetics and receptor binding affinity were also evaluated. RESULTS: Influenza RNA was detected in stool samples of 41% (36/87) of influenza A positive patients. Among the 36 stool samples subjected to viral isolation, 5 showed virus growth. Sequence analysis of isolated viruses revealed two distinct mutation patterns in fecal viruses. Set I viruses was able to replicate to higher titers in cell culture despite the limited number of mutations (6 mutations) compared to set II viruses (>10 mutations). Functional analysis of both sets revealed the ability to replicate efficiently in differentiated human bronchial cells. Receptor binding testing has also demonstrated their ability to bind α 2,3 and α 2,6 sialic acid receptors. CONCLUSION: The ability of fecal influenza viruses to replicate in intestinal cells and human 3D bronchial cells might suggest their possible contribution in virus transmission.
Authors: Elisabeth Mercier; Patrick M D'Aoust; Ocean Thakali; Nada Hegazy; Jian-Jun Jia; Zhihao Zhang; Walaa Eid; Julio Plaza-Diaz; Md Pervez Kabir; Wanting Fang; Aaron Cowan; Sean E Stephenson; Lakshmi Pisharody; Alex E MacKenzie; Tyson E Graber; Shen Wan; Robert Delatolla Journal: Sci Rep Date: 2022-09-22 Impact factor: 4.996