Methicillin sensitive Staphylococcus aureus producing Panton-Valentine leukocidin toxin in Trinidad & Tobago: a case report (original) (raw)
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Journal of Medical Case Reports, 2011
Introduction: Certain Staphylococcus aureus strains produce Panton-Valentine leukocidin, a toxin that lyses white blood cells causing extensive tissue necrosis and chronic, recurrent or severe infection. This report documents a confirmed case of methicillin-sensitive Staphylococcus aureus strain harboring Panton-Valentine leukocidin genes from Trinidad and Tobago. To the best of our knowledge, this is the first time that such a case has been identified and reported from this country. Case presentation: A 13-year-old Trinidadian boy of African descent presented with upper respiratory symptoms and gastroenteritis-like syptoms. About two weeks later he was re-admitted to our hospital complaining of pain and weakness affecting his left leg, where he had received an intramuscular injection of an anti-emetic drug. He deteriorated and developed septic arthritis, necrotizing fasciitis and septic shock with acute respiratory distress syndrome, leading to death within 48 hours of admission despite intensive care treatment. The infection was caused by S. aureus. Bacterial isolates from specimens recovered from our patient before and after his death were analyzed using microarray DNA analysis and spa typing, and the results revealed that the S. aureus isolates belonged to clonal complex 8, were methicillin-susceptible and positive for Panton-Valentine leukocidin. An autopsy revealed multi-organ failure and histological tissue stains of several organs were also performed and showed involvement of his lungs, liver, kidneys and thymus, which showed Hassal's corpuscles. Conclusion: Rapid identification of Panton-Valentine leukocidin in methicillin-sensitive S. aureus isolates causing severe infections is necessary so as not to miss their potentially devastating consequences. Early feedback from the clinical laboratories is crucial.
Journal of infection and public health, 2015
Panton-Valentine leukocidin (PVL) is a two-component toxin associated with the toxicity and virulence of Staphylococcus aureus. The presence of PVL is well documented in community-acquired methicillin-resistant S. aureus (CA-MRSA) and is observed in methicillin-susceptible S. aureus (MSSA) with variable prevalence. We assessed the prevalence of PVL in a sample of 93 MSSA patients in a healthcare facility in Eastern Saudi Arabia using real-time PCR for lukSF-PV genes. The presence or absence of PVL was correlated with age, gender, hospitalization status, infection site and antibiotic resistance. PVL was detected in 28 (30%) patient samples. PVL was associated with a greater likelihood of resistance to trimethoprim-sulfamethoxazole (a resistance of 39.2% of PVL-positive isolates compared to 6.1% of PVL-negative isolates) (p<0.0007). These results suggest a significant prevalence of PVL expression in MSSA strains in the study population and call for monitoring of and surveillance pr...
PLOS ONE, 2022
Background Panton-Valentine Leukocidin (PVL) toxin in Staphylococcus aureus has been associated with both severe pneumonia and skin and soft tissue infections. However, there are only limited data on how this virulence factor may influence the clinical course or complications of bacteremic S. aureus infections. Methods Between September 2016 and March 2018, S. aureus isolates from clinical cultures from hospitals in an academic medical center underwent comprehensive genomic sequencing. Four hundred sixty-nine (29%) of 1681 S. aureus sequenced isolates were identified as containing the genes that encode for PVL. Case patients with one or more positive blood cultures for PVL were randomly matched with control patients having positive blood cultures with lukF/lukS-PV negative (PVL strains from a retrospective chart review). Results 51 case and 56 control patients were analyzed. Case patients were more likely to have a history of injection drug use, while controls more likely to undergo...
Panton-Valentine leukocidin in community and hospital-acquired Staphylococcus aureus strains
Biotechnology & Biotechnological Equipment, 2014
Staphylococcus aureus causes serious hospital-acquired (HA) and community acquired (CA) infections. Skin and softtissue infections especially are sometimes caused by strains harbouring Panton-Valentine leukocidin (PVL). PVL belongs to a family of bi-component leukocidal toxins produced by staphylococci. It is a pore forming toxin encoded by lukF-PV and lukS-PV. A total of 70 S. aureus strains: 38 (54%) methicillin-resistant (MRSA) and 32 (46%) methicillin-susceptible (MSSA), were isolated from patients admitted to Dicle University Hospital (Turkey). Identification of S. aureus and antibiotics-susceptibility testing were performed with PHOENIX 100. PVL genes and mecA genes were detected by polymerase chain reaction. Of the 70 studied strains, 36 ones (51%) were community acquired and 34 ones (49%) were hospital acquired . A total of 38 (54%) strains were positive for mecA (mecAC), of which 32 ones (84%) were HA. Of the mecA strains, 30 (94%) were CA. Of the 70 studied strains, 12 (17%) strains were PVLC: 8 (22%) of the 36 CA strains and 4 (12%) of the 34 HA strains. Of the 12 PVLC strains, 4 strains were mecAC. The PVL positivity rate was 25% in MSSA, whereas 10.5% in MRSA. Of the overall PVLC strains, seven strains were obtained from wounds; four ones from skin abscess; and one from blood culture. Taken together, the obtained results showed a substantial level of PVL genes in the studied region. Although PVL is known as a common virulence factor of CA MRSA, HA MRSA isolates in our study showed a considerable rate of PVL positivity. Keywords: Staphylococcus aureus; Panton-Valentine leukocidin; MRSA; MSSA
Journal of Bacteriology & Parasitology, 2019
Background: Panton-Valentine leukocidin (PVL) is a bicomponent leukotoxin produced by <2% of Staphylococcus aureus (S. aureus) strains. PVL forms transmembrane pores that cause cell disruption and death. PVL is associated with skin necrotic lesions and severe necrotizing pneumonia. The methicillin-resistant S. aureus (MRSA) strains that harbor the lukS-PV gene (the gene encoding PVL toxin) are considered highly pathogenic since they can cause infections that are difficult to treat. Objective: This study aimed to optimize a multiplex PCR assay that can detect both methicillin-resistant S. aureus strains and their ability to produce PVL toxin isolated from Swedish patients. Methods: An optimized multiplex PCR-assay was developed to detect both nuc and lukS-PV genes and was applied to a collection of 80 MRSA clinical isolates collected between 1999 and 2004. Results: The results showed that 30/80 (40%) of all MRSA isolates were PVL-positive. The highest PVL prevalence (86%) was among abscess isolates. When PVL was correlated to staphylococcal protein A (spa) typing, the highest PVL positivity was among spa-type 44. Conclusion: The results of this study showed that the lukS-PV gene is common among Swedish community of the MRSA isolates.
Clinical Infectious …, 1999
Panton-Valentine leukocidin (PVL) is a cytotoxin that causes leukocyte destruction and tissue necrosis. It is produced by fewer than 5% of Staphylococcus aureus strains. A collection of 172 S. aureus strains were screened for PVL genes by polymerase chain reaction amplification. PVL genes were detected in 93% of strains associated with furunculosis and in 85% of those associated with severe necrotic hemorrhagic pneumonia (all community-acquired). They were detected in 55% of cellulitis strains, 50% of cutaneous abscess strains, 23% of osteomyelitis strains, and 13% of finger-pulp-infection strains. PVL genes were not detected in strains responsible for other infections, such as infective endocarditis, mediastinitis, hospital-acquired pneumonia, urinary tract infection, and enterocolitis, or in those associated with toxic-shock syndrome. It thus appears that PVL is mainly associated with necrotic lesions involving the skin or mucosa.
Acta Microbiologica et Immunologica Hungarica, 2017
Panton–Valentine leukocidin (pvl) toxin is an important virulence factor of Staphylococcus aureus. The main genes are coa and spa for distinguishing and typing of S. aureus isolates. The aim of this study was to investigate antibiotic resistance, presence of mecA and pvl genes, as well as epidemiological typing of these isolates according to polymerase chain reaction–restriction fragment length polymorphism (PCR-RFLP) method in clinical sample isolated from Rasht city, Iran. A total of 250 clinical samples have been isolated from different hospitals. First, isolates of S. aureus were identified through microbiological methods and their antibiotic sensitivity was determined by disk diffusion agar based on a standard method of Clinical and Laboratory Standards Institute. DNA was extracted by boiling and presence of pvl and mecA genes was investigated by PCR using specific primers. To type these isolates, amplification of fragments of coa and spa genes was done and restriction enzyme d...
2015
Methicillin-Resistant Staphylococcus aureus (MRSA), a pathogenic strain of Staphylococcus aureus, results in thousands of infections and associated deaths each year. A strain of MRSA, USA300, has been identified as the most common cause of skin and soft tissue infections acquired from the community in the United States. The goal of our study is to determine the prevalence of the USA300 strain, responsible for new community-associated MRSA infections, on Belmont University’s campus via PCR detection of the Panton-Valentine Leukocidin (PVL) gene, a bacterial toxin. We collected isolates from different locations on Belmont’s campus, confirmed them as MRSA using Gram staining, coagulase testing, and the use of the Kirby-Bauer disk diffusion assay. Bacterial DNA was isolated and PCR analysis performed to identify the PVL gene. We found PVL in Intermediate Methicillin Resistant Staphylococcus aureus isolates. This is surprising because the presence of PVL causes otherwise harmless Staph i...
Panton -Valentine leukocidin (PVL) produced by community acquired methicillin Staphyloccous aureus involved in skin and soft tissue infection comprised of two fraction namely PVLS and PVLF . In the present study , one of aims was to identify resistance profile for MRSA, and other aims are detection and purification of PVL toxin. A total of (100) MRSA isolates were recovered from hospitalized patients in Baghdad in 2013 . The percentage of PVLpositive was represented by 27% of isolates and 55.6% of them isolated from wound and 40.7% of them from abscess . All isolates were resistant to cloxacillin , followed by cefoxitin and cephalexin and lincomycin (86, 51 and 23)% respectively. Result of PVL toxin purified by sequatinal ammonium sulphate precipitation ion exchange and gel filtration with sepharos 6B then hydroxyl aptite chromatography revealed the protein concentration was 22.4 µg/ml with molecular weight 35.4kDa.