Investigation of clonal diversity, virulence genes, and antibiotic resistance of Staphylococcus aureus recovered from raw cow milk in southern Xinjiang, China

Abstract Background There have been no reports regarding the molecular characteristics, virulence features, and antibiotic resistance profiles of Staphylococcus aureus (S. aureus) from Hainan, the southernmost province of China. Methods Two hundred twenty-seven S. aureus isolates, consisting of 76 methicillin-resistant S. aureus (MRSA) and 151 methicillin-susceptible S. aureus (MSSA), were collected in 2013–2014 and 2018–2019 in Hainan, and investigated for their molecular characteristics, virulence genes, antibiotic resistance profiles and main antibiotic resistance genes. Results Forty sequence types (STs) including three new STs (ST5489, ST5492 and ST5493), and 79 Staphylococcal protein A (spa) types were identified based on multilocus sequence typing (MLST) and spa typing, respectively. ST398 (14.1%, 32/227) was found to be the most prevalent, and the prevalence of ST398-MSSA increased significantly from 2013 to 2014 (5.5%, 5/91) to 2018–2019 (18.4%, 25/136). Seventy-six MRSA isolates were subject to staphylococcus chromosomal cassette mec (SCCmec) typing. SCCmec-IVa was the predominant SCCmec type, and specifically, ST45-SCCmec IVa, an infrequent type in mainland China, was predominant in S. aureus from Hainan. The antibiotic resistance profiles and antibiotic resistance genes of S. aureus show distinctive features in Hainan. The resistant rates of the MRSA isolates to a variety of antibiotics were significantly higher than those of the MSSA isolates. The predominant erythromycin and tetracycline resistance genes were ermC (90.1%, 100/111) and tetK (91.8%, 78/85), respectively. Eleven virulence genes, including the Panton-Valentine leukocidin (pvl) and eta, were determined, and the frequency of eta and pvl were found to be 57.3 and 47.6%. Such high prevalence has never been seen in mainland China before. Conclusion S. aureus isolates in Hainan have unique molecular characteristics, virulence gene and antibiotic resistance profiles, and main antibiotic resistance genes which may be associated with the special geographical location of Hainan and local trends in antibiotic use.

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Antibiotic resistance and clonal diversity of invasive Staphylococcus aureus in the rural Ashanti Region, Ghana

BMC Infectious Diseases ◽

10.1186/s12879-016-2048-3 ◽

2016 ◽

Vol 16 (1) ◽

Cited By ~ 12

Author(s):

Denise Dekker ◽

Manuel Wolters ◽

Eva Mertens ◽

Kennedy Gyau Boahen ◽

Ralf Krumkamp ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Antibiotic Resistance ◽

Clonal Diversity ◽

Ashanti Region

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Molecular characteristics and virulence gene profiles of Staphylococcus aureus isolates in Hainan, China

10.21203/rs.2.10997/v4 ◽

2019 ◽

Author(s):

Xuehan Li ◽

Tao Huang ◽

Kai Xu ◽

Chenglin Li ◽

Yirong Li

Keyword(s):

Staphylococcus Aureus ◽

Antibiotic Resistance ◽

Resistance Genes ◽

Virulence Genes ◽

Mainland China ◽

Antibiotic Resistance Genes ◽

Virulence Gene ◽

Molecular Characteristics ◽

Staphylococcal Protein A ◽

Spa Typing

Abstract Background: There have been no reports regarding the molecular characteristics, virulence features, and antibiotic resistance profiles of Staphylococcus aureus ( S. aureus ) from Hainan, the southernmost province of China. Methods: 227 S. aureus isolates, consisting of 76 methicillin-resistant S. aureus (MRSA) and 151 methicillin-susceptible S. aureus (MSSA), were collected in 2013-2014 and 2018-2019 in Hainan, and investigated for their molecular characteristics, virulence genes, antibiotic resistance profiles and main antibiotic resistance genes. Results: Forty sequence types (STs) including three new STs (ST5489, ST5492 and ST5493), and 79 Staphylococcal protein A ( spa ) types were identified based on multilocus sequence typing (MLST) and spa typing, respectively. ST398 (14.1%, 32/227) was found to be the most prevalent, and the prevalence of ST398-MSSA increased significantly from 2013-2014 (5.5%, 5/91) to 2018-2019 (18.4%, 25/136). Seventy-six MRSA isolates were subject to staphylococcus chromosomal cassette mec (SCC mec ) typing. SCC mec- IVa was the predominant SCC mec type, and specifically, ST45-SCC mec IVa, an infrequent type in mainland China, was predominant in S. aureus from Hainan. The antibiotic resistance profiles and antibiotic resistance genes of S . aureus show distinctive features in Hainan. The resistant rates of the MRSA isolates to a variety of antibiotics were significantly higher than those of the MSSA isolates. The predominant erythromycin and tetracycline resistance genes were ermC (90.1%, 100/111) and tetK (91.8%, 78/85), respectively. Eleven virulence genes, including the Panton-Valentine leukocidin ( pvl ) and eta , were determined, and the frequency of eta and pvl were found to be 57.3% and 47.6%. Such high prevalence has never been seen in mainland China before. Conclusion: S. aureus isolates in Hainan have unique molecular characteristics, virulence gene and antibiotic resistance profiles, and main antibiotic resistance genes which may be associated with the special geographical location of Hainan and local trends in antibiotic use.

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Clonality, virulence genes, and antibiotic resistance of Staphylococcus aureus isolated from blood in Shandong, China

BMC Microbiology ◽

10.1186/s12866-021-02344-6 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Xuezhi Wang ◽

Dongzi Lin ◽

Zengqi Huang ◽

Jinmei Zhang ◽

Wenyan Xie ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Antibiotic Resistance ◽

Infection Control ◽

Virulence Genes ◽

Genetic Relatedness ◽

Protein A ◽

Epidemiological Data ◽

Control Measures ◽

Staphylococcal Protein A ◽

Infection Control Measures

Abstract Background Bloodstream infection (BSI) caused by Staphylococcus aureus (S. aureus) can be life-threatening and pose a great challenge to infection control and clinical treatment. However, little information exists regarding the characterization of S. aureus in BSI patients in Shandong, China. To identify the clonality, virulence genes, and antibiotic resistance of S. aureus in blood, a total of 101 nonrepetitive blood isolates were collected. The antibiotic resistance phenotypes were determined, and virulence genes were analyzed with polymerase chain reaction (PCR). Finally, the genetic relatedness was investigated with Staphylococcus chromosomal cassette mec (SCCmec) typing for methicillin-resistant S. aureus (MRSA) isolates, Staphylococcal protein A (spa), and multilocus sequence typing (MLST) for all of 101 isolates. Results Of the 101 S. aureus isolates, 24 MRSA isolates and 77 methicillin-susceptible S. aureus (MSSA) isolates were identified. Overall, MRSA isolates had higher resistance rates than MSSA isolates when exposed to any of the 15 antibiotics tested in this study except for trimethoprim/sulfamethoxazole. Among the 17 virulence genes tested in this study, hla, hld, and hlg could be detected in all isolates. MRSA isolates were more likely to carry seb and hlb genes, while MSSA isolates were more likely to carry seg and sei genes. Thirty-five sequence types (STs) and 49 spa types were identified, of which ST59-t437 and ST398-t571 were the most abundant. These two genotypes were also the most abundant ST-spa types in MRSA and MSSA isolates, but their abundances shifted over time, with ST398-t571 being the predominant genotype from 2016 to 2017, and ST59-t437 from 2018 to 2020. Besides, all the ST59-t437 isolates harbored hlgb gene, whereas most (88.9%) ST398-t571 did not. In addition, twenty-four MRSA isolates were subject to SCCmec typing. SCCmec IVa was the most prevalent SCCmec type, and all the ST59-t437 MRSA isolates were SCCmec IVa. We also observed 15 new STs, and some of them were MRSA. Conclusion These findings provide additional observations and epidemiological data for blood S. aureus isolates, which can improve future infection-control measures and aid in potential clinical treatments in hospitals and other clinical settings.

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Molecular characteristics and virulence gene profiles of Staphylococcus aureus isolates in Hainan, China

10.21203/rs.2.10997/v2 ◽

2019 ◽

Author(s):

Xuehan Li ◽

Tao Huang ◽

Kai Xu ◽

Chenglin Li ◽

Yirong Li

Keyword(s):

Staphylococcus Aureus ◽

Antibiotic Resistance ◽

Resistance Genes ◽

Virulence Genes ◽

Mainland China ◽

Antibiotic Resistance Genes ◽

Virulence Gene ◽

Molecular Characteristics ◽

Staphylococcal Protein A ◽

Spa Typing

Abstract Background: There have been no reports regarding the molecular characteristics, virulence features, and antibiotic resistance profiles of Staphylococcus aureus ( S. aureus ) from Hainan, the southernmost province of China. Methods: 227 S. aureus isolates, consisting of 76 methicillin-resistant S. aureus (MRSA) and 151 methicillin-susceptible S. aureus (MSSA), were collected in 2013-2014 and 2018-2019 in Hainan, and investigated for their molecular characteristics, virulence genes, antibiotic resistance profiles and main antibiotic resistance genes. Results: Forty sequence types (STs) including three new STs (ST5489, ST5492 and ST5493), and 79 Staphylococcal protein A ( spa ) types were identified based on multilocus sequence typing (MLST) and spa typing, respectively. ST398 (14.1%, 32/227) was found to be the most prevalent, and the prevalence of ST398-MSSA increased significantly from 2013-2014 (5.5%, 5/91) to 2018-2019 (18.4%, 25/136). Seventy-six MRSA isolates were subject to staphylococcus chromosomal cassette mec (SCC mec ) typing. SCC mec- IVa was the predominant SCC mec type, and specifically, ST45-SCC mec IVa, an infrequent type in mainland China, was predominant in S. aureus from Hainan. The antibiotic resistance profiles and antibiotic resistance genes of S . aureus show distinctive features in Hainan. The resistant rates of the MRSA isolates to a variety of antibiotics were significantly higher than those of the MSSA isolates. The predominant erythromycin and tetracycline resistance genes were ermC (90.1%, 100/111) and tetK (91.8%, 78/85), respectively. Eleven virulence genes, including the Panton-Valentine leukocidin ( pvl ) and eta , were determined, and the frequency of eta and pvl were found to be 57.3% and 47.6%. Such high prevalence has never been seen in mainland China before. Conclusion: S. aureus isolates in Hainan have unique molecular characteristics, virulence gene and antibiotic resistance profiles, and main antibiotic resistance genes which may be associated with the special geographical location of Hainan and local trends in antibiotic use.

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Molecular characteristics and virulence gene profiles of Staphylococcus aureus isolates in Hainan, China

10.21203/rs.2.10997/v1 ◽

2019 ◽

Author(s):

Xuehan Li ◽

Kai Xu ◽

Chenglin Li ◽

Tao Huang ◽

Yirong Li

Keyword(s):

Staphylococcus Aureus ◽

Antibiotic Resistance ◽

Virulence Genes ◽

Sccmec Type ◽

Mainland China ◽

Virulence Gene ◽

Molecular Characteristics ◽

Spa Typing ◽

Gene Profiles ◽

High Prevalence

Abstract Background: There have been no reports regarding the molecular characteristics, virulence features, and antibiotic resistance profiles of Staphylococcus aureus (S. aureus) from Hainan, the southernmost province of China. Methods: 227 S. aureus isolates, consisting of 76 methicillin-resistant S. aureus (MRSA) and 151 methicillin-susceptible S. aureus (MSSA), were collected in 2013-2014 and 2018-2019 in Hainan, and investigated for their molecular characteristics, virulence genes, and antibiotic resistance profiles. Results: Thirty-four sequence types (STs) and 79 spa types were identified based on multilocus sequence typing (MLST) and spa typing, respectively. ST398 (14.1%, 32/227) was found to be the most prevalent, and moreover, the prevalence of ST398-MSSA increased significantly from 2013-2014 (5.5%, 5/91) to 2018-2019 (18.4%, 25/136). Seventy-six MRSA isolates were subject to staphylococcus chromosomal cassette mec (SCCmec) typing. SCCmec-IVa was the predominant SCCmec type, and specifically ST45-SCCmec IVa, an infrequent type in mainland China, was predominant in S. aureus from Hainan. Eleven virulence genes, including the Panton-Valentine leukocidin (pvl) and eta, were determined, and the positive rates of eta and pvl were found to be 57.3% and 47.6%. Such high prevalence has never been seen in mainland China before.

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Antibiotic resistant bacteria in raw cow milk and milk products retailed in the northern region of Ghana; a food safety challenge

Journal of Food Safety and Hygiene ◽

10.18502/jfsh.v5i4.5701 ◽

2021 ◽

Author(s):

Ezekiel Kofi Vicar ◽

Patrick K. Feglo ◽

Samuel E. K. Acquah ◽

Walana Williams ◽

Courage K. S. Saba ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Antibiotic Resistance ◽

Food Safety ◽

Northern Region ◽

Cow Milk ◽

Diffusion Method ◽

Resistant Bacteria ◽

Klebsiella Pneumonia ◽

Milk Products ◽

Agar Disc

The presence of antimicrobial resistant foodborne bacteria is a major food safety challenge for food that is consumed raw. Abuse and overuse of antibiotics in the agriculture sector has been identified as a contributory factor to the rising threat of antibiotic resistance. In many developing countries where milk is marketed and consumed raw through informal channels, the occurrence of bacterial contamination is high and poses a major public health risk. This situation is exacerbated when caused by antimicrobial resistant bacteria. Hence this study was conducted to determine the antimicrobial resistant pattern of bacteria in raw cow milk and milk products retailed in the Northern Region of Ghana. Antibiotic resistance profiles were established for 150 bacteria isolates (Escherichia coli, E. coli O157:H7, Klebsiella pneumonia, Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella spp. Shigella spp. and Proteus spp.) obtained from the culture of raw milk (n=210) and milk products (n=60) retailed within the Northern region of Ghana. Susceptibility to nine antimicrobials commonly used in veterinary and human medical practice was performed on all the isolates using the agar disc diffusion method according to Clinical and Laboratory Standards Institute guidelines. Isolates showed highest resistance to Nalidixic acid followed by Chloramphenicol, Gentamicin, Trimethoprim-sulfamethoxazole and Ceftriaxone but were most susceptible to Ciprofloxacin and Ampicillin. About 25 – 47.6 % of Staphylococcus aureus showed resistance to Cefoxitin. Milk and milk products sold in the northern region of Ghana are contaminated with bacterial pathogens with high levels of antimicrobial resistance. A one health approach is required to curtail the threat of antibacterial resistant bacteria in the food chain.

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Prevalence, molecular characterization and anti-microbial resistance pattern of Staphylococcus species isolates from buck semen

10.21203/rs.3.rs-919491/v1 ◽

2021 ◽

Author(s):

Gururaj Kumaresan ◽

Chetna Gangwar ◽

Anil Kumar Mishra ◽

Ashok Kumar ◽

Suresh Dinkar Kharche ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Antibiotic Resistance ◽

Molecular Characterization ◽

Virulence Genes ◽

Resistance Pattern ◽

Bacterial Isolates ◽

Potential Threat ◽

Mannitol Salt Agar ◽

High Prevalence ◽

Staphylococcus Spp

Abstract Staphylococcus aureus is one of the most prevalent pathogens, and a causative agent of a variety of infections in humans and animals. A total of 48 semen samples were collected from healthy bucks of different breeds to investigate the prevalence of S. aureus . Antimicrobial resistance and virulence of the Staphylococcus isolates were determined to assess the adverse effects of them on buck fertility. The bacterial isolates were tentatively confirmed as Staphylococcus spp. based on the Gram’s staining, growth on Mannitol salt agar and catalase test. Overall, 75% (n = 36) of the samples were positive for Staphylococcus spp. from the total 48 buck semen ejaculates from different breeds. Out of 36 staphylococcal isolates, 23 (47.92%) were coagulase negative (CoNS) and 13 (27.08%) were coagulase positive Staphylococcus (CoPS) based on the slide coagulase test. In the current study, on the basis of molecular characterization, we identified S. aureus , S. chromogenes, S. haemolyticus, S. sciuri, S. simulans and S. epidermidis amongst the staphylococcal isolates in the buck semen. This study revealed a high prevalence of Staphylococcus species in semen of the healthy bucks. The isolates exhibited varying degrees of multidrug resistance genotypically as well as phenotypically. The presence of antibiotic resistance and virulence genes may pose a potential threat to reproductive health of animals, highlighting the need for vigilant monitoring of these isolates at the time of semen cryopreservation.

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Prevalence, antibiotic resistance, virulence and genetic diversity of Staphylococcus aureus isolated from bulk tank milk samples of U.S. dairy herds

BMC Genomics ◽

10.1186/s12864-021-07603-4 ◽

2021 ◽

Vol 22 (1) ◽

Author(s):

Kruthika Patel ◽

Sandra M. Godden ◽

Erin E. Royster ◽

Brian A. Crooker ◽

Timothy J. Johnson ◽

...

Keyword(s):

Public Health ◽

Staphylococcus Aureus ◽

Antibiotic Resistance ◽

Dairy Cows ◽

Virulence Genes ◽

Dairy Herds ◽

Drug Resistant ◽

Bulk Tank Milk ◽

Milk Samples ◽

Bulk Tank

Abstract Background Colonization of dairy cows by Staphylococcus aureus (S. aureus), especially those which are multi-drug resistant and toxin producing, is a concern for animal health and well-being as well as public health. The objective of this study was to investigate the prevalence, antibiotic resistance, gene content and virulence determinants of S. aureus in bulk tank milk samples (BTM) from U.S. dairy herds. Results BTM samples were collected, once in winter and once in summer, from 189 U.S. dairy herds. Of 365 BTM samples cultured, the sample and herd prevalence of S. aureus in BTM was 46.6% (170 of 365 samples) and 62.4% (118 of 189 herds), respectively. Among a subset of 138 S. aureus isolates that were stored for further analysis, 124 were genome sequenced after being confirmed as S. aureus using phenotypic tests. The most commonly identified antimicrobial resistance-associated gene was norA (99.2%) and mecA gene responsible for methicillin resistance (MRSA) was identified in one isolate (0.8%). The most frequently detected putative virulence genes were aur (100%), hlgB (100%), hlgA, hlgC, hlb (99.2%), lukE (95.9%) and lukD (94.3%). In the 53 staphylococcal enterotoxin positive isolates, sen (37.9%), sem (35.5%), sei (35.5%) and seg (33.1%) were the most frequently detected enterotoxin genes. Among the 14 sequence types (ST) and 18 spa types identified, the most common was ST2187 (20.9%) and t529 (28.2%), respectively. The most predominant clone was CC97 (47.6%) followed by CC unknown (36.3%). The single MRSA isolate belonged to ST72-CC8, spa type t126 and was negative for the tst gene but harbored all the other virulence genes investigated. Conclusion Our findings indicated a high prevalence of S. aureus in BTM of U.S. dairy herds, with isolates showing little evidence of resistance to antibiotics commonly used to treat mastitis. However, isolates often carried genes for the various enterotoxins. This study identified predominant genetic clones. Despite lower prevalence, the presence of MRSA and multi-drug resistant strains in BTM poses a significant risk to animal and public health if their number were to increase in dairy environment. Therefore, it is necessary to continuously monitor the use of antibiotics in dairy cows.

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Molecular characteristics and virulence gene profiles of Staphylococcus aureus isolates in Hainan, China

10.21203/rs.2.10997/v3 ◽

2019 ◽

Author(s):

Xuehan Li ◽

Tao Huang ◽

Kai Xu ◽

Chenglin Li ◽

Yirong Li

Keyword(s):

Staphylococcus Aureus ◽

Antibiotic Resistance ◽

Resistance Genes ◽

Virulence Genes ◽

Mainland China ◽

Antibiotic Resistance Genes ◽

Virulence Gene ◽

Molecular Characteristics ◽

Staphylococcal Protein A ◽

Spa Typing

Abstract Background: There have been no reports regarding the molecular characteristics, virulence features, and antibiotic resistance profiles of Staphylococcus aureus ( S. aureus ) from Hainan, the southernmost province of China. Methods: 227 S. aureus isolates, consisting of 76 methicillin-resistant S. aureus (MRSA) and 151 methicillin-susceptible S. aureus (MSSA), were collected in 2013-2014 and 2018-2019 in Hainan, and investigated for their molecular characteristics, virulence genes, antibiotic resistance profiles and main antibiotic resistance genes. Results: Forty sequence types (STs) including three new STs (ST5489, ST5492 and ST5493), and 79 Staphylococcal protein A ( spa ) types were identified based on multilocus sequence typing (MLST) and spa typing, respectively. ST398 (14.1%, 32/227) was found to be the most prevalent, and the prevalence of ST398-MSSA increased significantly from 2013-2014 (5.5%, 5/91) to 2018-2019 (18.4%, 25/136). Seventy-six MRSA isolates were subject to staphylococcus chromosomal cassette mec (SCC mec ) typing. SCC mec- IVa was the predominant SCC mec type, and specifically, ST45-SCC mec IVa, an infrequent type in mainland China, was predominant in S. aureus from Hainan. The antibiotic resistance profiles and antibiotic resistance genes of S . aureus show distinctive features in Hainan. The resistant rates of the MRSA isolates to a variety of antibiotics were significantly higher than those of the MSSA isolates. The predominant erythromycin and tetracycline resistance genes were ermC (90.1%, 100/111) and tetK (91.8%, 78/85), respectively. Eleven virulence genes, including the Panton-Valentine leukocidin ( pvl ) and eta , were determined, and the frequency of eta and pvl were found to be 57.3% and 47.6%. Such high prevalence has never been seen in mainland China before. Conclusion: S. aureus isolates in Hainan have unique molecular characteristics, virulence gene and antibiotic resistance profiles, and main antibiotic resistance genes which may be associated with the special geographical location of Hainan and local trends in antibiotic use.

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