Abstract:
:We characterised Lancefield group B streptococcal (GBS) isolates causing invasive disease among non-pregnant adults in Portugal between 2009 and 2015. All isolates (n = 555) were serotyped, assigned to clonal complexes (CCs) by multilocus sequence typing and characterised by surface protein and pilus island gene profiling. Antimicrobial susceptibility was tested by disk diffusion and resistance genotypes identified by PCR. Overall, serotype Ia was most frequent in the population (31%), followed by serotypes Ib (24%) and V (18%). Serotype Ib increased significantly throughout the study period (p < 0.001) to become the most frequent serotype after 2013. More than 40% of isolates clustered in the CC1/alp3/PI-1+PI-2a genetic lineage, including most isolates of serotypes Ib (n = 110) and V (n = 65). Erythromycin and clindamycin resistance rates were 35% and 34%, respectively, both increasing from 2009 to 2015 (p < 0.010) and associated with CC1 and serotype Ib (p < 0.001). The Ib/CC1 lineage probably resulted from acquisition of the type Ib capsular operon in a single recombination event by a representative of the V/CC1 macrolide-resistant lineage. Expansion of the new serotype Ib/CC1 lineage resulted in increased macrolide resistance in GBS, causing invasive disease among adults in Portugal. The presence of this clone elsewhere may predict more widespread increase in resistance.
journal_name
Euro Surveilljournal_title
Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletinauthors
Lopes E,Fernandes T,Machado MP,Carriço JA,Melo-Cristino J,Ramirez M,Martins ER,The Portuguese Group For The Study Of Streptococcal Infections.doi
10.2807/1560-7917.ES.2018.23.21.1700473subject
Has Abstractpub_date
2018-05-01 00:00:00issue
21eissn
1025-496Xissn
1560-7917journal_volume
23pub_type
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