View clinical trials related to Staphylococcal Infections.
Filter by:Staphylococcus aureus is an important pathogen causing a wide spectrum of infections . The organism usually colonizes the skin and mucous of humans and several animal species. Multiple body sites can be colonized in humans, however, the anterior nares of the nose are the most frequent carriage site for S. aureus. Other sites for carriage include the skin, perineum, and pharynx . It has been shown that there is an increased prevalence of staphylococcus infections, which may be attributed to its carriage in anterior nares and hands of health care workers and patients . The pathogenic mechanisms enabling S. aureus to cause serious infections could include: biofilm which protects organisms from host immune response; opsonophagocytosis and antimicrobial agents, thus leading to chronic and persistent infections. Antibiotic resistance associated with S.aureus infections is a great concern for the clinicians to prevent spread of infections. Methicillin was commonly used for these infections before the emergence of MRSA which is developed due to irrational use of antibiotics, prolonged hospital stay, nasal and hand carriage in health care staff. Also vancomycin, linezolid and mupirocin are used in treating infections,as well as decolonization of carriers . Mupirocin act by inhibiting the protein synthesis of bacteria by binding specifically to isoleucyl-tRNAsynthetase enzyme. The irrational use of Mupirocin among patients and its carriage in health care staff has led to the emergence of resistance to this antibiotic. . MupA, plasmid mediated gene, has a great role in mupirocinresistence as it had a supplementary modified isoleucyltRNAsynthetase which leads to the high level resistance to Mupirocin. The mupA gene has the ability to facilitate and disseminate the resistance mechanism in different patterns . Linezolid,thefirstoxazolidinonedrug,waslaunchedin2001andis still displaying excellent in vitro activity against Staphylococcus epidermidis on a global scale,although outbreaks of linezolidresistant S. epidermidis (LRSE) are occasionally reported.. Linezolid resistance is mediated by, mutations in the 23S rRNA gene, altering the drug-binding site, and/or the 50S ribosomal proteins L3, L4 and L22, impairing linezolid binding;,Oracquisition of the primarily plasmid-encoded genes cfr, encoding a methyltransferase, or optrA, encoding an ABC transporter, or the cfr homologues cfr(B) and cfr(C). While cfr can mediate the PhLOPSA phenotype (resistance to phenicols, lincosamides,oxazolidinones, pleuromutilins and streptogramin A compounds), optrA confers oxazolidinone and phenicolresistance only.. Pathogenecity of S. aureus is regulated by various factors ,one of them is the accessory gene regulatory (agr) system. It consists of 2 divergently transcribed loci (3 kb) controlled by means of 2 promoters P2 and P3. Most of clinical isolates of acute infections have a functional agr system and all, like strains, produce RNAIII in vitro and in vivo. Agr deficiency has been related to increased biofilm formation because RNAIII reduces the expression of surface adhesins and increases the production of capsule, toxins, and proteases. The agr system is supposed to regulate over 70 genes, 23 of which are renowned virulence factors. There are 2 classes of virulence factors regulated by agr. The first class includes virulence factors implicated in attachment to the host and immune evasion, whereas the second class contains genes engaged in the production of exoproteins related to invasion and toxin production . The activation of the agr system switches the bacterium from an adhesive, colonizing commensal into an invasive and aggressive pathogen(Roux A et al; 2009). Major virulence factors in S. aureus, exfoliative toxins (ETs), toxic shock syndrome toxin (TSST-1), and staphylococcal enterotoxins (SEs) are involved in host colonization, invasion of damaged skin and mucus, gastrointestinal infection, and prevarication of host defense mechanisms. Indeed, agr operon including agrA, agrB, agrC, and agrD genes regulate over 70 genes in S. aureus 23 of which control its pathogenicity and invasive infections . Moreover, S. aureus can be stratified into 4 different groups (agr I, agr II, agr III, and agr IV) according to the sequences of agrC (auto inducing peptide) and agrD (cyclic AIP) genes. It is stated that agr types are different in their properties and prevalence in various geographical areas thus, identification of predominant types in each region may well be functional .
Antistaphylococcal penicillins are recommanded as first-line agent in methicillin-suceptible Staphylococcus aureus bacteraemia. Several studies in progress are investigating the efficacy and safety of cefazolin compared with antistaphylococcal penicillins. Cefazolin has broader spectrum than antistaphylococcal penicillins. The hypothesis of this project is that cefazoline could be responsible for a higher rate of bacterial resistance. The aim is to study the association between the emergence of bacterial resistance and the consumption of cefazolin and antistaphylococcal penicillins.
A Phase IIa, double-blind, placebo-controlled, randomised study designed to evaluate the efficacy, safety and tolerability of two dosing regimens with LTX-109 administered topically to the anterior nares in subjects with persistent carriage of Staphylococcus aureus (S. aureus).
This is a Phase I/IIa trial designed to evaluate topical bacteriophage therapy in patients with diabetic foot ulcers.
This is a Phase 1, first time in human study enrolling approximately 42 healthy adult subjects (18-45 yrs) from one study site. The purpose of this study is to evaluate the safety, tolerability and PK of MW14 in healthy adult volunteers administered as a single IV dose compared with placebo, across 5 cohorts. The 5 dose cohorts will enroll sequentially. Subjects will be followed for safety from the time of Informed Consent through 85 days post dose.
A Phase I/IIa, double-blind, placebo-controlled, randomised study designed to evaluate the safety, tolerability, exploratory efficacy and exposure of LTX-109 administered topically to the anterior nares in subjects with persistent carriage of S. aureus (methicillin-susceptible S. aureus [MSSA] and/or methicillin-resistant S. aureus [MRSA]).
Given the paucity of pharmacological data on cefazolin treatment of Methicillin-susceptible S. aureus (MSSA) complicated S. aureus infection (CSAI), the primary purpose of this study is to investigate the probability of pharmacological target attainment (in the blood and infected tissue) with standard intermittent bolus administration of cefazolin in patients with CSAI caused by MSSA by determining plasma concentrations of cefazolin and exact Minimum inhibitory concentration (MICs) of the causative MSSA strains in patients with various disease severities (e.g. critically ill vs. noncritically ill patients). - Sub-study quantitative measurement of Torque Teno virus (TTV): The primary purpose of this sub-study is to describe the viral kinetics of TTV in CSAI patients and to explore the association of TTV viremia with clinical outcomes and molecular markers of activation of the immune system. - Sub-study investigating antibiotic concentrations in sweat as a non-invasive therapeutic drug monitoring
Staphylococcus lugdunensis is a coagulase-negative staphylococcus belonging to the human commensal cutaneous flora, and has been little studied in the field of prosthetic joint infections. However, it shares many virulence traits with Staphylococcus aureus, including many adhesins and its ability to form biofilm, and the few series of cases reports a significant failure rate.
Recently, the investigators described a new mucoid phenotype of Staphylococcus aureus cultured from the airways of cystic fibrosis (CF) patients.In this observational study, the investigators plan to determine the prevalence of mucoid S. aureus in respiratory specimens of CF patients and a possible impact of mucoid S. aureus on lung disease severity.
This is a single center, open-label phase1b clinical trial. The study will evaluate the safety and immunogenicity of an experimental recombinant staphylococcus aureus vaccine with different immunization schedules in healthy adults aged 18-70 years, including day 0-3-7, day 0/0-3-7, day 0/0-7 and day 0/0-7-14.