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Modern Applied Statistics With S

Urban wastewater treatment plants as hotspots for antibiotic resistant bacteria and genes spread into the environment: a review.

Summary: Staphylococcus aureus is an important cause of skin and soft-tissue infections (SSTIs), endovascular infections, pneumonia, septic arthritis, endocarditis, osteomyelitis, foreign-body infections, and sepsis. Methicillin-resistant S. aureus (MRSA) isolates were once confined largely to hospitals, other health care environments, and patients frequenting these facilities. Since the mid-1990s, however, there has been an explosion in the number of MRSA infections reported in populations lacking risk factors for exposure to the health care system. This increase in the incidence of MRSA infection has been associated with the recognition of new MRSA clones known as community-associated MRSA (CA-MRSA). CA-MRSA strains differ from the older, health care-associated MRSA strains; they infect a different group of patients, they cause different clinical syndromes, they differ in antimicrobial susceptibility patterns, they spread rapidly among healthy people in the community, and they frequently cause infections in health care environments as well. This review details what is known about the epidemiology of CA-MRSA strains and the clinical spectrum of infectious syndromes associated with them that ranges from a commensal state to severe, overwhelming infection. It also addresses the therapy of these infections and strategies for their prevention.

Community-associated methicillin-resistant Staphylococcus aureus: epidemiology and clinical consequences of an emerging epidemic.

EASL Clinical Practice Guidelines: Management of chronic hepatitis B

There is still a low level of clinical awareness regarding Legionnaires' disease 25 years after it was first detected. The causative agents, legionellae, are freshwater bacteria with a fascinating ecology. These bacteria are intracellular pathogens of freshwater protozoa and utilize a similar mechanism to infect human phagocytic cells. There have been major advances in delineating the pathogenesis of legionellae through the identification of genes which allow the organism to bypass the endocytic pathways of both protozoan and human cells. Other bacteria that may share this novel infectious process are Coxiella burnetti and Brucella spp. More than 40 species and numerous serogroups of legionellae have been identified. Most diagnostic tests are directed at the species that causes most of the reported human cases of legionellosis, L. pneumophila serogroup 1. For this reason, information on the incidence of human respiratory disease attributable to other species and serogroups of legionellae is lacking. Improvements in diagnostic tests such as the urine antigen assay have inadvertently caused a decrease in the use of culture to detect infection, resulting in incomplete surveillance for legionellosis. Large, focal outbreaks of Legionnaires' disease continue to occur worldwide, and there is a critical need for surveillance for travel-related legionellosis in the United States. There is optimism that newly developed guidelines and water treatment practices can greatly reduce the incidence of this preventable illness.

/pdf/legionella-and-legionnaires-disease-25-years-of-1rtsg68z6u.pdf

Legionella and Legionnaires' Disease: 25 Years of Investigation

Antibiotic resistance of E. coli in sewage and sludge.

Molecular detection of herpes simplex virus (HSV) DNA is recognized as the reference standard assay method for the sensitive and specific diagnosis of central nervous system infections caused by HSV. In this study, a molecular assay based on real-time PCR on the LightCycler (LC) instrument was evaluated and compared with a home-brew molecular assay. The detection limit of the LC assay was determined with 10-fold dilutions of plasmid pS4 with the SalI restriction fragment of the DNA polymerase gene and with the First European Union Concerted Action HSV Proficiency Panel. A total of 59 cerebrospinal fluid (CSF) specimens were investigated for the comparative study. With plasmid pS4, the detection limit of the LC assay was found to be 104 copies per ml, i.e., 12.5 copies per run. When samples of the First European Union Concerted Action HSV Proficiency Panel were tested, 2 × 103 to 5 × 103 HSV type 1 genome equivalents (GE) per ml, i.e., 2.5 to 6.3 GE per run, could consistently be detected. There was a correlation between the LC assay and the home-brew assay in 55 of 59 specimens. In conclusion, the LC assay allows very rapid detection of HSV DNA in CSF. It was found to be laborsaving and showed sufficient sensitivity.

https://www.researchgate.net/profile/Holger_Rabenau/publication/12441031_Detection_of_Herpes_simplex_virus_DNA_by_real-time_PCR/links/00463529cb063de7ba000000.pdf?disableCoverPage=true

Detection of Herpes Simplex Virus DNA by Real-Time PCR

A molecular assay for the simultaneous detection of a Staphylococcus aureus-specific gene and the mecA gene, responsible for the resistance to methicillin in staphylococci, was evaluated. The assay included an automated DNA extraction protocol conducted with a MagNA Pure instrument and real-time PCR conducted with a LightCycler instrument. The performance and robustness of the assay were evaluated for a suspension of methicillin-resistant S. aureus (MRSA) strain with a turbidity equivalent to a McFarland standard of 0.5, which was found to be the ideal working concentration. The specificity of the new molecular assay was tested with a panel of 30 gram-negative and gram-positive bacterial strains other than MRSA. No cross-reactivity was observed. In a clinical study, 109 isolates of MRSA were investigated. All clinical MRSA isolates gave positive results for the S. aureus-specific genomic target, and all but one were positive for the mecA gene. In conclusion, the new molecular assay was found to be quick, robust, and laborsaving, and it proved to be suitable for a routine molecular diagnostic laboratory.

Detection of Methicillin-Resistant Staphylococcus aureus and Simultaneous Confirmation by Automated Nucleic Acid Extraction and Real-Time PCR

Vulvovaginal candidasis (VVC) is a common disease. The majority of cases is caused by Candida albicans, but in recent years an increase has been observed in the frequency of non-albicans Candida infections, especially due to C. glabrata and C. tropicalis. The aim of the study was to assess the prevalence of non-albicans Candida infections in patients suffering from VVC. Therefore, the statistical data of culture-confirmed VVC ascertained at the Institute of Hygiene (Medical University Graz) have been studied. Altogether, 10,463 samples from patients with vulvovaginal complaints were analysed in the years 2000-2004, a number of 3184 proved to be culture-positive for yeast. Candida albicans was the most prevalent cause in 87.9% of all cases. Non-albicans Candida yeast were detected in 12.1%, mainly C. glabrata and Saccharomyces cerevisiae. During a 1-year period 185 patients showed more than one episode of VVC. Patients aged 21-40 years were significantly more prone to suffer from VVC compared with other age-related groups.

Egon Marth

Papers

Antibiotic resistance of E. coli in sewage and sludge.

Detection of Herpes Simplex Virus DNA by Real-Time PCR

Detection of Methicillin-Resistant Staphylococcus aureus and Simultaneous Confirmation by Automated Nucleic Acid Extraction and Real-Time PCR

A 5‐year (2000–2004) epidemiological survey of Candida and non‐Candida yeast species causing vulvovaginal candidiasis in Graz, Austria

ESBL-producing E. coli in Austrian sewage sludge.