prevalence serotyping and antimicrobials resistance mechanism of salmonella enterica isolated from clinical and environmental samples in saudi arabia

enterica.1 The causative agent of Salmonellainfectionsaredividedintotwomaintypes enterica serotype Typhi and Paratyphi A, B and C causing Enteridi-tisandS.. Materials and methods Salmone

h tt p : / / w w w b j m i c r o b i o l c o m b r /

Mohamed A El-Tayeba, Abdelnasser S.S Ibrahima,b, ∗, Ali A Al-Salamaha, Khalid S.

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Almaarya, Yahya B Elbadawia

aKing Saud University, College of Science, Department of Botany and Microbiology, Riyadh, Saudi Arabia

bNational Research Center, Pharmaceutical Industries Research Division, Department of Chemistry of Natural and Microbial Products, Cairo, Egypt

a r t i c l e i n f o

Article history:

Keywords:

Salmonella

Serotyping

determinants

a b s t r a c t

Salmonellais recognizedasa commonfoodbornepathogen,causingmajorhealth

Isola-tionofSalmonellaspp.fromclinicalandenvironmentalsamplesresultedinisolationof

mechanisms

creativecommons.org/licenses/by-nc-nd/4.0/)

∗ Corresponding author at:DepartmentofChemistryofNaturalandMicrobialProducts,NationalResearchCenter,El-BuhouthSt.,Dokki,

Q2

http://dx.doi.org/10.1016/j.bjm.2016.09.021

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Entero-bacteriaceae;andthe genusconsistsoftwomainspecies;S.

bongori and S enterica.1 The causative agent of

Salmonellainfectionsaredividedintotwomaintypes

enterica serotype Typhi and Paratyphi A, B and C causing

Enteridi-tisandS entericaserotypeTyphimurium,whichhaveabroad

Salmonellacaused severe and life-threatening diseases,the

ofSalmonellaisolated inSaudiArabia,emergence of

iso-lates

Materials and methods

Salmonella spp including: Xylose lysine deoxycholate agar

TheSalmonellaisolates(n=33)wereinoculatedintonutrient

Salmonellaspp.strains(n=33)astemplates.ThePCRreaction

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out underthefollowingconditions: initialdenaturationfor

(http://www.ncbi.nlm.nih.gov/genbank/index.html)

andPseudomonas aeruginosaATCC27853wereusedascontrol organisms

S enterica strains (n=33) according to previously reported

Results

inTable2,allisolates(n=33)wereaffiliatedtovariousstrains

ofSalmonella entericasubsp.entericawith96–99%similarities;

enterica strains based on 16S rDNA sequences isshown in Fig.1

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Table 1 – Primers sequence specific to different antimicrobials resistant determinants inSalmonella.

R-GCCATACCTACGGCGATACC

R-TAACAGCAGCTCGGCGTATT

R-CTGCCTGGACAACATTGCTT

R-GTAATGGGCCAATAACACCG

R-AGCAACAGAATCGGGAAC

␤-Lactams

R-GGGGCTTGATGCTCACTCCA

R-GACAGTTACCAATGCTTAATCA

oxa-1

R-TCTTGGCTTTTATGCTTG

R-ATGCAGAAGTAGAACGCG

R-TTAACCCTTTTGCCAGATTT

R-AAGCGCAGCCACAGGATAAAT

R-TTAGCCCTTTIICCAATTTT

Table 2 – Identification ofSalmonellastrains(n= 33) based on 16S-rDNA sequencing.

Salmonella enteritidis NS2

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80 58

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97 96

Salmonella enteritidis SA28 Salmonella enteritidis SA25 Salmonella enteritidis NS3 Salmonella typhimurium SA2 Salmonella typhimurium SA5 Salmonella enteritidis SA35 Salmonella enteritidis NS5 Salmonella enteritidis NS4 Salmonella enteritidis SA36 Salmonella enteritidis SA37 Salmonella enteritidis SA26 Salmonella enteritidis NS1 Salmonella typhimurium SA1 Salmonella enteritidis SA9 Salmonella typhimurium SA40 Salmonella paratyphi C SA49 Salmonella paratyphi C Para Salmonella paratyphi B CR Salmonella paratyphi B SAM Salmonella typhi SA6 Salmonella typhi SA4 Salmonella typhi SA21 Salmonella paratyphi C SA12 Salmonella typhi SA14 Salmonella paratyphi C SA7 Salmonella paratyphi C SA10 Salmonella arizonae NS7

Salmonella arizonae NS6 Salmonella arizonae NS9 Salmonella arizonae NS10

0.005

Yersinia enterocolitica ATCC 9610

Fig 1 – Dendrogram showing genetic relatedness among the isolatedSalmonella entericastrains based on 16Sr DNA

sequences analysis.

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Table 3 – Serotyping and serogrouping of the isolatedS entericastrains(n= 33).

0 5 10 15 20 25 30 35

Antibiotic Sensitive Resistant Intermediate

Fig 2 – Antibiotics susceptibility testing against theS entericaisolates(n= 33).

tetA, tetBandtetGfortetracycline,carb-like, tem-likeand

oxa-1-likefor␤-lactamantibiotics,floRgeneforchloramphenicol,

dfrA1, dfrBanddfrA14genesfortrimethoprim,anddetectionof

22 S enterica isolates, whereas both tem and oxa-1 genes

Discussion

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Salmonella (n=18) is more frequent than the typhoid one

Salmonella to those antibiotics is likely due to the

S enterica isolatesexhibiting resistance tothird-generation

enterica strains (n=33) revealed the detection of carb-like

entericaisolateswereattributedtobla TEM-1andbla oxa-1.5,17,23

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Table 5 – Distribution of various antibiotic resistance genes(n= 11) inS entericastrains(n= 33) P: present; A: absent.

Salmonella

isolate

dfrA17 and dfrA12, respectively.23,29–31 The resistance to

S enterica isolatesexhibitedresistanceto chloramphenicol

S enterica isolates(n=5) in bothgyrA and parC with large

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gyrA (Asp87Asn) and one in parC (Thr54Ser) ; and point

enterica.

Conclusion

Conflict of interest

Acknowledgments

Appendix A Supplementary data

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