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comparing the bacterial diversity of acute and chronic dental root canal infections比较急性和慢性的细菌多样性牙齿根管感染
Comparing the Bacterial Diversity of Acute and Chronic Dental Root Canal Infections 1 ´ 2 ˆ 2 4 1 Adriana L. Santos , Jose F. Siqueira Jr. *, Isabela N. Roc¸as , Ederson C. Jesus , Alexandre S. Rosado , James M. Tiedje3 ´ 1 Institute of Microbiology Prof. Paulo de Goes, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil, 2 Department of Endodontics and Molecular Microbiology ´ ´ Laboratory, Estacio de Sa University, Rio de Janeiro, Brazil, 3 Center for Microbial Ecology, Michigan State University, East Lansing, Michigan, United States of America, ´ 4 Laboratory of Soil Microbiology, EMBRAPA, Seropedica, Brazil Abstract This study performed barcoded multiplex pyrosequencing with a 454 FLX instrument to compare the microbiota of dental root canal infections associated with acute (symptomatic) or chronic (asymptomatic) apical periodontitis. Analysis of samples from 9 acute abscesses and 8 chronic infections yielded partial 16S rRNA gene sequences that were taxonomically classified into 916 bacterial species-level operational taxonomic units (OTUs) (at 3% divergence) belonging to 67 genera and 13 phyla. The most abundant phyla in acute infections were Firmicutes (52%), Fusobacteria (17%) and Bacteroidetes (13%), while in chronic infections the dominant were Firmicutes (59%), Bacteroidetes (14%) and Actinobacteria (10%). Members of Fusobacteria were much more prevalent in acute (89%) than in chronic cases (50%). The most abundant/prevalent genera in acute infections were Fusobacteri
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