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Genetic characterization respiratory syncytial virus in Kerala, the southern part of India
Author(s) -
Patil Savita L.,
Balakrishnan Anukumar
Publication year - 2017
Publication title -
journal of medical virology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 121
eISSN - 1096-9071
pISSN - 0146-6615
DOI - 10.1002/jmv.24842
Subject(s) - virology , virus , pneumovirus , biology , respiratory system , paramyxoviridae , viral disease , anatomy
Respiratory syncytial virus (RSV) is an important cause of acute lower respiratory tract infection (ALRI) in infants and young children globally. RSV presents two antigenic groups RSV‐A and ‐B. Genetic variability is also very high within each group. RSV circulation varies year to year and even varies among different regions. Data on circulatory pattern of RSV are available from other parts of India except Kerala. The aim of the study was to generate data about groups and genotypes of circulating RSV in Kerala. In this study, RSV positive samples received during January, 2012 to December, 2014 were used for genetic characterization. The samples were tested by using nucleocapsid (N) gene‐based conventional multiplex reverse transcriptase polymerase chain reaction (RT‐PCR) to identify the RSV group. Genotyping was done by nucleotide sequencing of the C‐terminal region of the glycoprotein (G) gene. Out of the 130 patient samples tested, 49 samples were positive for RSV. Among the positive samples, 32 belong to the RSV‐A and 17 belong to RSV‐B virus. Phylogenetic analysis revealed that all RSV‐A sequences ( n = 22) belonged to NA1 genotype and five of the sequences showed the novel 72 nucleotide duplication and clustered into the newly designated ON1 genotype. All RSV‐B sequences ( n = 17) were clustered into the BA (BA9 and 10) genotype. From this study, we concluded both RSV‐A and ‐B were co‐circulated in Kerala and RSV‐A was observed predominantly in 2012 and RSV‐B in 2014. As per our best of knowledge, BA10 genotype is first observed in India.