M
Mário Ramirez
Researcher at Instituto de Medicina Molecular
Publications - 143
Citations - 6591
Mário Ramirez is an academic researcher from Instituto de Medicina Molecular. The author has contributed to research in topics: Serotype & Multilocus sequence typing. The author has an hindex of 40, co-authored 137 publications receiving 5723 citations. Previous affiliations of Mário Ramirez include Universidade Nova de Lisboa & University of Lisbon.
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Streptococcus agalactiae Causing Neonatal Infections in Portugal (2005–2015): Diversification and Emergence of a CC17/PI-2b Multidrug Resistant Sublineage
TL;DR: It is identified for the first time in Europe a recently emerging sublineage characterized by the loss of PI-1 (CC17/PI-2b), simultaneously resistant to macrolides, lincosamides, and tetracycline, also exhibiting high-level resistance to streptomycin and kanamycin.
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Molecular Characterization of the Complete 23F Capsular Polysaccharide Locus of Streptococcus pneumoniae
Mário Ramirez,Alexander Tomasz +1 more
TL;DR: The complete DNA sequence of the capsular locus 23F of Streptococcus pneumoniae is presented and it is shown that the locus is composed of 18 open reading frames flanked at the 5' and 3' ends by the genes dexB and aliA.
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Genomic analysis reveals the molecular basis for capsule loss in the group B Streptococcus population.
Roberto Rosini,Edmondo Campisi,Matteo De Chiara,Hervé Tettelin,C. Daniela Rinaudo,Chiara Toniolo,Matteo M. E. Metruccio,Silvia Guidotti,Uffe B. Skov Sørensen,Mogens Kilian,Mário Ramirez,Robert Janulczyk,Claudio Donati,Guido Grandi,Immaculada Margarit +14 more
TL;DR: Genome based phylogenetic analysis extended to a wide population of sequenced strains confirmed the recently observed high clonality among GBS lineages mainly containing human strains, and revealed a much higher degree of diversity in the bovine population.
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Acquisition of new capsular genes among clinical isolates of antibiotic-resistant Streptococcus pneumoniae.
Mário Ramirez,Alexander Tomasz +1 more
TL;DR: Analysis of the sequence of the capsular locus of a penicillin-resistant serotype 23F isolate from Mexico showed that part of the cpsA gene of this strain, as well as genes cpsQ and cpsR, had high degrees of identity to the sequences of the homologous genes in isolates expressing serotype 19F.
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Rapid Inversion of the Prevalences of Macrolide Resistance Phenotypes Paralleled by a Diversification of T and emm Types among Streptococcus pyogenes in Portugal
TL;DR: In Portugal erythromycin resistance of 26.6% remained constant during 1998 to 2003, however in 1998 the MLSB phenotype dominated, whereas in 2003 the M phenotype prevailed.