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The present study aimed to determine the antimicrobial susceptibility pattern and the capsular serotypes of GBS isolated in Eastern Sicily over 5\u00a0years, from January 2015 to December 2019. A total of 3494 GBS were isolated from vaginal swabs of pregnant women (37\u201339\u00a0weeks), as recommended by the Centers for Disease Control and Prevention. Capsular polysaccharide\u2019s typing of GBS was determined by a commercial latex agglutination test containing reagents to serotypes I\u2013IX. The antimicrobial resistance pattern of GBS was determined through the disk diffusion method (Kirby-Bauer) and the double-disk diffusion test on Mueller-Hinton agar plates supplemented with 5% defibrinated sheep blood, according to the guidelines of the Clinical and Laboratory Standards Institute. Serotypes III (1218, 34.9%) and V (1069, 30.6%) were the prevalent colonizers, followed by not typable (570, 16.3%) and serotypes Ia (548, 15.7%), Ib (47, 1.3%), II (40, 1.1%), and IV (2, 0.1%). All 3494 clinical isolates were susceptible to cefditoren and vancomycin. Resistance to penicillin, ampicillin, levofloxacin, clindamycin, and erythromycin was observed in 6 (0.2%), 5 (0.1%), 161 (4.6%), 1090 (31.2%), and 1402 (40.1%) of the strains, respectively. Most of erythromycin-resistant GBS (1090\/1402) showed the cMLS\n                    <jats:sub>B<\/jats:sub>\n                    phenotype, 276 the M phenotype, and 36 the iMLS\n                    <jats:sub>B<\/jats:sub>\n                    phenotype. Our findings revealed a higher prevalence of serotype III and a relevant resistance rate, among GBS strains, to the most frequently used antibiotics in antenatal screening.\n                  <\/jats:p>","DOI":"10.1007\/s10096-020-03992-8","type":"journal-article","created":{"date-parts":[[2020,7,22]],"date-time":"2020-07-22T17:02:40Z","timestamp":1595437360000},"page":"2387-2396","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":44,"title":["Streptococcus agalactiae in pregnant women: serotype and antimicrobial susceptibility patterns over five years in Eastern Sicily (Italy)"],"prefix":"10.1007","volume":"39","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2463-9047","authenticated-orcid":false,"given":"Carlo","family":"Genovese","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1831-0432","authenticated-orcid":false,"given":"Floriana","family":"D\u2019Angeli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5576-3070","authenticated-orcid":false,"given":"Valentina","family":"Di Salvatore","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6682-5943","authenticated-orcid":false,"given":"Gianna","family":"Tempera","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4822-0363","authenticated-orcid":false,"given":"Daria","family":"Nicolosi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,7,22]]},"reference":[{"key":"3992_CR1","doi-asserted-by":"crossref","unstructured":"Raabe VN, Shane AL (2019) Group B Streptococcus (Streptococcus agalactiae). 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