Data on respiratory syncytial virus detailed by J. Reiche and co-authors
2009 JUL 14 - (NewsRx.com) -- "The variability between respiratory syncytial virus (RSV) strains is one of the features of RSV infections that might contribute to the ability of the virus to infect people repeatedly and cause yearly outbreaks. To study the molecular epidemiology of RSV, more than 1,400 RSV isolates from human nasopharyngeal aspirates or nasal or throat swabs from patients with respiratory illness were identified and differentiated by TaqMan reverse transcription-PCR into groups A and B. RSV group A was dominant in seven out of nine epidemic seasons," researchers in Berlin, Germany report. "Phylogenetic analysis revealed that RSV group A genotypes GA2 and GA5 circulated from 1998 to 2007. Genotype GA7 was present in only two seasons (1999 to 2000 and 2002 to 2003). Comparison of the synonymous mutation/nonsynonymous mutation ratios showed greater evidence for selection pressure for genotype GA2 (1.18) than for GA5 (4.34). Partial protein sequences were predicted to encode G proteins of 298 amino acids in length and in a few cases of G proteins of 297 amino acids in length. Amino acid analysis also revealed genotype-specific amino acid substitutions: two substitutions for genotype GA2, seven for GA5, and three for GA7. Two to four putative, genotype-specific N-linked glycosylation sites were determined. Predicted O-glycosylation sites included 22 to 34 residues," wrote J. Reiche and colleagues. The researchers concluded: "This study provides for the first time data on the circulation pattern of RSV group A genotypes and their molecular characterization in Germany during nine consecutive epidemic seasons.." Reiche and colleagues published their study in the Journal of Clinical Microbiology (Genetic Variability of Group A Human Respiratory Syncytial Virus Strains Circulating in Germany from 1998 to 2007. Journal of Clinical Microbiology, 2009;47(6):1800-1810). For additional information, contact B. Schweiger, Robert Koch Institute, NRZ Influenza, Virale Infekt FG12, Nordufer 20, D-13353 Berlin, Germany. Publisher contact information for the Journal of Clinical Microbiology is: American Society Microbiology, 1752 N St. NW, Washington, DC 20036-2904, USA. Keywords: Germany, Berlin, Clinical Microbiology, Epidemics, Epidemiology, Infectious Disease, Pulmonology, Respiratory Syncytial Virus, Viral. This article was prepared by Virus Weekly editors from staff and other reports. Copyright 2009, Virus Weekly via NewsRx.com.
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