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首页> 外文期刊>Vaccine >Invasive Streptococcus pneumoniae in Canada, 2011-2014: Characterization of new candidate 15-valent pneumococcal conjugate vaccine serotypes 22F and 33F
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Invasive Streptococcus pneumoniae in Canada, 2011-2014: Characterization of new candidate 15-valent pneumococcal conjugate vaccine serotypes 22F and 33F

机译:加拿大侵袭性肺炎链球菌,2011-2014年:表征新的候选15价肺炎球菌结合疫苗血清型22F和33F

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Emerging non-PCV-13 Streptococcus pneumoniae serotypes 22F and 33F are included in a new 15-valent pneumococcal conjugate vaccine currently undergoing clinical trials in the United States. This study assessed the antimicrobial resistance and genetic relatedness of these two emerging pneumococcal serotypes. Of the 5075 invasive pneumococcal isolates collected in Canada from 2011 to 2014, 9.8% (497/5075) were serotype 22F and 3.2% (160/5075) were serotype 33F. Despite being among the top 4 most common serotypes collected each study year, serotype 22F demonstrated >= 98% susceptibility to all antimicrobials tested except clarithromycin and few were multi -drug resistant (MDR) (0.8%, 4/497). Serotype 22F isolates were highly clonal (ST433), with two isolates showing high relatedness to MDR international clone Sweden(15A)-25 (ST63). Conversely, serotype 33F showed greater antimicrobial resistance, greater genetic diversity and a higher proportion of MDR isolates (8.8%, 14/160). The prevalence of serotype 33F increased significantly during 2011-2014 (p=0.005). (C) 2016 Elsevier Ltd. All rights reserved.
机译:新兴的非PCV-13肺炎链球菌血清型22F和33F包括在目前正在美国进行临床试验的新型15价肺炎球菌结合疫苗中。这项研究评估了这两种新兴的肺炎球菌血清型的抗药性和遗传相关性。 2011年至2014年在加拿大收集的5075例侵袭性肺炎球菌分离株中,血清型22F为9.8%(497/5075),33F型为3.2%(160/5075)。尽管22F血清型是每个研究年度收集的前4种最常见的血清型之一,但对所有测试的抗生素的敏感性大于等于98%(除克拉霉素外),而且很少有多药耐药性(MDR)(0.8%,4/497)。血清型22F分离株是高度克隆的(ST433),其中两个分离株显示与MDR国际克隆Sweden(15A)-25(ST63)高度相关。相反,血清型33F表现出更大的抗药性,更大的遗传多样性和更高比例的MDR分离株(8.8%,14/160)。在2011-2014年期间,血清型33F的患病率显着增加(p = 0.005)。 (C)2016 Elsevier Ltd.保留所有权利。

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