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Diversity and antimicrobial resistance profile of bacteria isolated from sheep mastitis and bulk-tank milk in the east-centre region of Portugal

2026-09-15Artigo de investigação Acesso aberto
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dc.contributor.authorPereira, Maria
dc.contributor.authorBaptista, Alexandra Lameira
dc.contributor.authorRosário, Mariana
dc.contributor.authorCruz, Rita
dc.contributor.authorEsteves, Fernando
dc.contributor.authorMadanelo, João
dc.contributor.authorNóbrega, Carmen
dc.contributor.authorMega, Cristina
dc.contributor.authorGarcia, C.
dc.contributor.authorCoelho, Catarina
dc.contributor.authorArede dos Santos, Carla Sofia
dc.contributor.authorMalva, Madalena
dc.contributor.authorVala Correia, Helena Maria
dc.contributor.authorFerreira, Tiago
dc.date.accessioned2026-07-07T10:47:56Z
dc.date.available2026-07-07T10:47:56Z
dc.date.issued2026-09-15en_US
dc.date.updated2026-07-01T14:09:18Z
dc.description.abstractThe microbiological quality of milk reflects both udder health and the subsequent contamination that can occur through direct and indirect reservoirs. This study aimed to identify bacterial diversity in milk samples from ewes with mastitis and in bulk-tank milk, and to investigate their antibiotic susceptibility/resistance profiles. A total of 232 milk samples were analysed and 22 bacterial species were isolated, with Staphylococcus aureus (20.3%) and S. epidermidis (18.6%) as the dominant species. The diversity of bacterial species isolated from the bulk-tank was higher and included 44 species, dominated by E. coli (20.6%), S. aureus (7.8%) and Hafnia alvei (7.2%). Antimicrobial susceptibility testing was performed on 217 bacterial isolates. E. coli isolated from individual milk samples revealed high rates of resistance to penicillins and tetracyclines, whereas S. aureus revealed high rates of resistance to aminoglycosides, polymyxin, sulfonamides and tetracycline, maintaining high levels of susceptibility to third generation cephalosporins, lincosamides, some macrolides, penicillins, phenicols and pleuromutilins. The resistance profile of bacteria isolated from the bulktank milk was more concerning than that of the milk of ewe with mastitis. These results point to the need to implement structural improvements on farms and raise awareness about strengthening biosecurity, medical prophylaxis and control of access to veterinary medicines to improve milk quality and reduce the use of antibiotics.eng
dc.description.versionN/A
dc.identifier.doi10.46419/cvj.57.5.9en_US
dc.identifier.slugcv-prod-5062821
dc.identifier.urihttp://hdl.handle.net/10400.19/10068
dc.language.isoeng
dc.peerreviewedyes
dc.relationResearch Center in Natural Resources, Environment and Society
dc.relationUID/04413/2020
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectEscherichia coli
dc.subjectcoagulase-negative Staphylococcus
dc.subjectStaphylococcus aureus
dc.subjectintramammary infection
dc.subjectbulk-tank milk
dc.subjectantimicrobial susceptibility testing
dc.titleDiversity and antimicrobial resistance profile of bacteria isolated from sheep mastitis and bulk-tank milk in the east-centre region of Portugalen_US
dc.typeresearch articleen_US
dspace.entity.typePublication
oaire.awardNumberUIDB/00681/2020
oaire.awardTitleResearch Center in Natural Resources, Environment and Society
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00681%2F2020/PT
oaire.citation.endPage473
oaire.citation.issue5/2026
oaire.citation.startPage458
oaire.citation.titleCroatian veterinary journalen_US
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNamePereira
person.familyNameCruz
person.familyNameEsteves
person.familyNameNóbrega
person.familyNameMega
person.familyNameCoelho
person.familyNameArede dos Santos
person.familyNameMalva
person.familyNameVala Correia
person.givenNameMaria
person.givenNameRita
person.givenNameFernando
person.givenNameCarmen
person.givenNameCristina
person.givenNameCatarina
person.givenNameCarla Sofia
person.givenNameMadalena
person.givenNameHelena Maria
person.identifier822013
person.identifier.ciencia-id5712-2E1D-26A9
person.identifier.ciencia-idA11E-DBFF-16E8
person.identifier.ciencia-id6E19-A3CC-897E
person.identifier.ciencia-idD51F-A1CF-C925
person.identifier.ciencia-id0E10-D744-A71E
person.identifier.ciencia-idE013-1502-3B9A
person.identifier.ciencia-id7A1E-E85E-FFA4
person.identifier.orcid0000-0002-4054-9124
person.identifier.orcid0000-0002-5767-7835
person.identifier.orcid0000-0003-0589-0746
person.identifier.orcid0000-0003-3941-799X
person.identifier.orcid0000-0002-9913-875X
person.identifier.orcid0000-0002-5272-7303
person.identifier.orcid0000-0001-5908-8500
person.identifier.orcid0000-0003-4982-0184
person.identifier.orcid0000-0001-6829-4867
person.identifier.scopus-author-id33467893100
person.identifier.scopus-author-id56079061700
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.cv.cienciaid7A1E-E85E-FFA4 | Helena Maria Vala Correia
rcaap.rightsopenAccessen_US
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