Respiratory syncytial virus (RSV) infection common in infections of the lungs and lower respiratory system, especially in children younger than 5 years of domestic infections RSV Thailand often found, especially during the rainy season, and found the prevalence increasing every year, but education and an understanding of the fuel with the least education. The purpose of this research to study the way molecular biology of infections by RSV change the sequencing of genes from the nose cavity number G clear 23 samples that RSV infection in 2014, which is undergoing treatment in the hospital siriraj hospital. By the specimen, positive results will exclude the type of infections by methods (group) PCR and Real-time PCR when you know what kind of infection and will increase the number of nested-PCR method to analyze sequencing and phylogenetic tree generating genotype by studies in gene study results found that G from the specimen as A group accounted for RSV ro.Yala 55 (12/22) and the specimen that is 45 percent group B (10/22) and from the study of phylogenetic tree as part of A group G is a gene found for RSV and group ON1 B genotype is equal to 8 and the genotype BA7 10 samples, respectively. From the study it was found that RSV infection was found in the country, Thailand also has not changed, a new genotype, but should, however, be added to the total number of samples in order to increase the confidence and accuracy, and is useful in providing information to the next study.
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