Abstract
Human metapneumovirus (hMPV) has emerged as a frequent cause of acute respiratory infections (ARI) among young children. The prevalence and genetic diversity of hMPV circulating in Chennai, Southern India, has not been studied yet. Hence, this study was aimed to investigate the prevalence, co-infection with other respiratory viruses like HRSV A and B, influenza A and B, hRV and HPIV 1–4 viruses, socio-demographic associations, and genotypes of hMPV among children in Chennai. A total of 350 nasal swab specimens were collected from children with ARI during April 2016 to August 2018 and tested for hMPV by real time PCR method. In this study, hMPV was detected in 4% (14/350) of the samples. One hMPV positive sample was found to be co-infected with influenza B virus. The mean and median ages of the children with hMPV infection were 61.5 months (5.1 years) and 83 months (6.9 years), respectively. Phylogenetic analysis of the partial F gene revealed the presence of A2c subcluster among the study strains as well as with B1 and B2 lineages. The prevalence data obtained in this study is important in evaluating the role of hMPV in childhood ARI and emphasizes the importance of routine viral diagnosis in hospitals. To the best of our knowledge, this is the first study to report the prevalence, seasonality, and genetic diversity of hMPV in Chennai as well as the first study to report A2c subcluster of hMPV among children in India.
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Acknowledgements
We thank Dr. Elilarasi, Dr. Kalpana, and Dr. Sarathbalaji — Department of Pulmonology, Institute of Child Health, Egmore, Chennai; Dr. Indumathi — Pediatric Clinic, Triplicane, Chennai; and Dr. Rohit Bharadwaj — Rabindran’s Health Care Centre, Ambattur, Chennai for providing the clinical samples used in this study.
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This work was supported by the Intramural Research funds, University of Madras, Chennai, India.
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The study was approved by the Institutional Human Ethics Committee of Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras (Approval No: UM/IHEC/12–2014-II and UM/IHEC/07–2017-I).
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Supplementary file3 (jpg 418 kb) Supplement Fig. 1 Maximum Likelihood fits of 24 different nucleotide substitution models
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Supplementary file4 (jpeg 365 kb) Supplement Fig. 2 Deduced amino acid alignment of partial F gene of hMPV strains belonging to the A2c subcluster obtained in this study
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Supplementary file5 (jpg 370 kb) Supplement Fig. 3 Deduced amino acid alignment of partial F gene of hMPV strains belonging to the B1 lineage obtained in this study
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Supplementary file6 (jpg 393 kb) Supplement Fig. 4 Deduced amino acid alignment of partial F gene of hMPV strains belonging to the B2 lineage obtained in this study
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Hindupur, A., Menon, T. & Dhandapani, P. Molecular investigation of human metapneumovirus in children with acute respiratory infections in Chennai, South India, from 2016–2018. Braz J Microbiol 53, 655–661 (2022). https://doi.org/10.1007/s42770-022-00689-2
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DOI: https://doi.org/10.1007/s42770-022-00689-2