Staphylococcus aureus diseases caused

Staphylococcus aureus is known for its ability to produce a variety of toxins and many disease syndromes. One of the most frequently observed diseases is staphylococcal tonsillitis. These bacteria are frequently present on tonsils of healthy carriers. Patients that are affected by tonsillitis swallow staphylococci hidden in tonsil crypts. However, in this case staphylococci do not cause any gastrointestinal symptoms in the host organism, even if they enter the gastrointestinal tract. The barrier of gastric juice and conditions in a small intestine inhibit the outgrowth of staphylococci and toxin production -gastroenteritis is caused solely by a toxin produced outside the host organism. 

Sulfouamides have a broad spectrum of antimicrobial activity, including Staphylococcus aureus, nonenterococcal types of Streptococcus, Listeria monocytogenes, Nocardia, Neisseria, Haemophilius influenzae, enteric Gram-negative types of E. coli, Proteus mirabilis, and a few forms of anaerobic bacteria. Above all, sulfonamides are used for treating uncomplicated infections of the urinary tract, infections caused by Nocardia asteroids, streptococcal pharyngitis, menigococcal diseases, toxoplasmosis, and others. 

Fridkin S.K., J. Hageman, L.K. McDougal, et al. (2003). Epidemiological and microbiological characterization of infections caused by Staphylococcus aureus with reduced susceptibility to vancomycin. United States, 1997-2001. Clinical Infectious Diseases 36 429 39. 

S. A. Roberts, J. Robson, K. Read, N. Bak, J. Hurley, P.D.R. Johnson, A.J. Morris, B.C. Mayall, and M.L. Grayson (2004). Treatment outcomes for serious infections caused by methicillin-resistant Staphylococcus aureus with reduced vancomycin susceptibility. Clinical Infectious Diseases 38 521-528. 

Gram-positive spherical bacteria (cocci) arranged in clusters are staphylococci. Staphylococcus epidermidis is foimd normally on the skin and mucous membranes in high numbers. However, it can cause an infection if an opportunity such as a skin abrasion occms. Staphylococcus aureus is also found on the skin and mucous membranes but in lower numbers than S. epidermidis. It is a much more virulent pathogen and usually causes more serious disease. About half the ocular infections that occur are caused by staphylococci. 

Common causative organisms in adults with canaliculitis include Staphylococcus aureus and Actinomyces species. Primary herpetic infections (herpes simplex, varicella, and vaccinia) have a higher prevalence among patients younger than age 20 years and often present with cutaneous manifestations of the infectious disease. Chronic allergies may also be associated with canalicular obstruction. Occasionally, patients may suffer from canalicular obstruction as a result of topical antimetabolite treatment such as 5-fluorouracil or mitomycin C. 

Mastitis, an inflammatory reaction of the mammary gland, usually resulting from a microbial infection, is a widespread disease seen in cattle throughout the world. The major bacterial species that are responsible for bovine mastitis are Staphylococcus aureus. Streptococcus dysgalactiae, Streptococcus agalactiae, Streptococcus uberis, and E. coli. Of these, the first three cause a contagious route of transmission, whereas Streptococcus uberis and... 

Perhaps the most well known observation in the history of drug development is Alexander Fleming s chance observation in 1928 that colonies of the bacterium Staphylococcus aureus died when they were adjacent to colonies of the mold Penicillium notatum. Spores of the mold had landed accidentally on plates growing the bacteria. Fleming soon realized that the mold produced a substance that could kill disease-causing bacteria. This discovery led to a fundamentally new approach to the treatment of bacterial infections. Howard Florey and Ernest Chain developed a powdered form of the substance, termed penicillin, that became a widely used antibiotic in the 1940s. 

The most relevant of the coagulase-positive species is Staphylococcus aureus subsp. aureus (further S. aureus), pathogenic to both humans and animals. It is an extraordinary versatile pathogen and the major causative agent of numerous hospital-and community acqnired infections. The spread, survival and prevalence of antibiotic resistant clones of S. aureus are immensely important problems for human health. Major antibiotic resistance problems are typically associated with methicillin (oxacillin) resistant S. aureus strains (MRSA) and, more recently, vancomycin-intermediate (VISA) and vancomycin-resistant (VRSA) strains. Up to 30% of the hnman population carries S. aureus without any symptoms. In most cases, however, the colonizing strain serves as an endogenous reservoir for clinical infections (von Eiff et al. 2004). The disease spectrum includes abscesses, bacteremia, central nervons... 

Tea tree oil, obtained from Melaleuca altemifolia, has been shown to be highly active against Candida albicans, which causes thrush in infants and other diseases, and, in addition, excellent control of vaginitis caused by the same organism. Bacterial impetigo, caused by Staphylococcus aureus and Streptococcus sp. has also been treated successfully. The constitution of the oil has been analyzed and it contains 1,8-cineole 9.1%, p-cymene 16.4%, terpinen-4-ol 31.2% and a-terpineol 3.5% (Figure 1 [4,5,6,7]). 

Azithromycin, an azalide macrolide antibiotic (500 mg p.o. as a single dose on day 1, followed by 250 mg daily on days 2 to 5 total accumulation dose is 1.5 g), is indicated in the treatment of acute bacterial exacerbations of chronic obstructive pulmonary disease caused by Haemophilus influenzae, Moraxella (Branhamella) catarrhalis, or Streptococcus pneumoniae mild community-acquired pneumonia caused by H. influenzae or S. pneumoniae uncomplicated skin and skin-structure infections caused by Staphylococcus aureus, Streptococcus pyogenes, or S. agalactiae second-line therapy of pharyngitis or tonsillitis caused by S. pyogenes and in nongonococcal urethritis or cervicitis caused by Chlamydia trachomatis. 

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