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Topic: Methicillin

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Methicillin resistant Staphylococcus aureus

Methicillin Sensitive Staphylococcus Aureus

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	Methicillin-Resistant Staphylococcus aureus
		The bacterium is often referred to as “staph.” It is estimated that 30 percent of the population carries staph on the skin or in the nose.
		Methicillin or penicillin and cephalosporins are generally used to treat staph infections.
		About 1 percent of persons have a type of staph resistant to these antibiotics called methicillin- resistant staph aureus, which is often referred to as MRSA.
	www.idph.state.il.us /public/hb/hbmrsa.htm (589 words)

	Eagle-Type Methicillin Resistance: New Phenotype of High Methicillin Resistance under mec Regulator Gene Control -- ...
		Conversion of Eagle-type resistance to homo methicillin resistance by mecI gene inactivation.
		The methicillin concentrations used for induction were 0, 1, 8, and 128 µg/ml from left to right for each strain.
		The incubation temperature was 37°C for panels A to F and 30°C for panels G to I. Note that the cytokilling activity of methicillin at 128 µg/ml was remarkably decreased with the strains with the Eagle-type or the homo-type methicillin resistance and with the transformant strains harboring multiple copies of hmrA or hmrB genes.
	aac.asm.org /cgi/content/full/45/3/815 (5484 words)

	Postgraduate Medicine: Containing methicillin-resistant S aureus
		Penicillinase-stable semi-synthetic penicillins (eg, methicillin, cloxacillin sodium [Cloxapen], nafcillin sodium [Nallpen, Unipen]) and cephalosporins (eg, cephalothin sodium, cefazolin sodium [Ancef, Kefzol]) were developed in the late 1950s and early 1960s to create beta-lactam antibiotics that are not inactivated by beta-lactamase.
		Methicillin was among the first of these agents to be introduced into clinical practice, but strains of MRSA were identified as early as 1961.
		Most MRSA strains are heterogeneously resistant to methicillin, so only a small proportion of the S aureus colonies that grow from a clinical specimen may show resistance in standard laboratory tests.
	www.postgradmed.com /issues/2001/10_01/simor.htm (2954 words)

	AEGiS-HEPP: Spotlight: Methicillin-Resistant Staphylococcus Aureus (MRSA) - December 2003
		Within a few years of the first clinical use of penicillin in the 1940s, resistance due to beta lactamases was identified.
		Within a year of the introduction of the semisynthetic, beta lactamase-stable, penicillin methicillin in 1960, MRSA strains were identified.
		Methicillin resistant strains are resistant to all beta lactam antibiotics, including penicillins and cephalosporins.
	www.aegis.com /pubs/hepp/2003/HEPP2003-1203.html (2194 words)

	Methicillin Resistant Staphylococcus Aureus: A Problem in the Burns Unit
		As well, other strains were identified that had a broad pattern of resistance, not only to methicillin, but also to the aminoglycosides and cephalosporins.
		The PBPs occur in the bacterial cell wall and have an enzymatic role in the synthesis of peptidolgycan.
		Prasanna M. and Thomas C.: A profile of methicillin resistant Staphylococcus aureus infection in the burn center of the Sultanate of Oman.
	www.medbc.com /meditline/review/egypt/vol_27/num_1/text/vol27n1p1.htm (4350 words)

	BioMed Central \| Full text \| Methicillin-resistant Staphylococcus aureusprevalence: Current susceptibility patterns in ...
		This study was undertaken to analyze the prevalence of methicillin resistance among isolates at a regional hospital in Trinidad, and document the current resistance profile of MRSA and methicillin-sensitive Staphylococcus aureus (MSSA) to the commonly used anti-staphylococcal agents.
		The primary importance is to decrease the prevalence of MRSA by measures such as rapid and reliable identification of the organisms along with their susceptibility patterns to other antibiotics, isolation and treatment of patients and carriers, and strict adherence to proper hand washing practices by health care providers.
		The methicillin resistance rate of 20.8% as seen among hospital isolates was considerable higher than the 1999 rate of 12.5%.
	www.biomedcentral.com /1471-2334/6/83 (3358 words)

	Methicillin definition - Medical Dictionary definitions of popular medical terms
		Methicillin: A semisynthetic penicillin-related antibiotic, also known as Staphcillin, that once was effective against staphylococci (staph) resistant to penicillin because they produce the enzyme penicillinase.
		Rarely used now, methicillin has been largely superceded by Vancomycin.
		Over the past 50 years, staph bacteria have become resistant to various antibiotics, including the commonly used penicillin-related antibiotics, including methicillin.
	www.medterms.com /script/main/art.asp?articlekey=24074 (114 words)

	Medical Dictionary: Methicillin - WrongDiagnosis.com
		Methicillin: antibiotic drug of the penicillin family used in the treatment of certain staphylococcal infections
		Methicillin: One of the PENICILLINS which is resistant to PENICILLINASE but susceptible to a penicillin-binding protein.
		Methicillin : semisynthetic penicillin used as an antibacterial in resistant staphylococcal infections.
	www.wrongdiagnosis.com /medical/methicillin.htm (261 words)

	INFORMATION ABOUT METHICILLIN RESISTANT STAPHYLOCOCCUS AUREUS (MRSA)\| Bone Marrow Transplant Program \| Norris Cotton ... (Site not responding. Last check: 2007-10-03)
		MRSA is an abbreviation for strains of Staphylococcus aureus (S. aureus) that are resistant to the antibiotic methicillin.
		In the past these infections could be dependably treated with IV methicillin or oral agents for less serious infections.
		Once MRSA is common in a community or institution it becomes necessary to provide initial treatment for serious S. aureus infections with vancomycin until the actual sensitivities of the organism are known.
	www.cancer.dartmouth.edu /bonemarrow/infc8241.shtml (505 words)

	glmM Operon and Methicillin-Resistant glmM Suppressor Mutants in Staphylococcus aureus -- Glanzmann et al. 43 (2): 240 ...
		Methicillin resistance in Staphylococcus aureus is due to an additional penicillin-binding protein (PBP), PBP 2' (PBP 2a),
		the absence of methicillin, whereas in the presence of methicillin
		Peptidoglycan composition in heterogeneous Tn551 mutants of a methicillin-resistant Staphylococcus aureus strain.
	aac.asm.org /cgi/content/full/43/2/240 (3445 words)

	How Penicillin Kills Bacteria
		Methicillin is a β-lactam antibiotic which acts on cell wall production much like penicillin.
		MRSA produce β-lactamase which selectively destroys methicillin thereby protecting the bacteria.
		superbug, methicillin resistant Staph aureus, Streptococcus pneumoniae, antibiotic misuse, vancomycin resistant Enterococcus, cephalosporin, penicillinase, antibiotic resistance
	www.cellsalive.com /pen.htm (202 words)

	Methicillin-resistant Staphylococcus aureus - prevention and control
		It is important to note that clinical laboratories do not use the methicillin antibiotic for direct susceptibility testing (often referred to incorrectly as sensitivity testing).
		Methicillin is an antibiotic which is sensitive to physical pressures like temperatures.
		Oxacillin-resistance when it occurs under appropriate laboratory testing indicates that a strain of Staphylococcus aureus is resistant to methicillin (MRSA).
	www.cinetwork.com /otero/mrsa.html (2341 words)

	Detection and expression of methicillin/oxacillin resistance in multidrug-resistant and non-multidrug-resistant ...
		to be susceptible to oxacillin and methicillin according to
		MICs of 16 and 24 mg/L and to methicillin with MICs of 32, 24,
		Chambers, H. Methicillin resistance in staphylococci: molecular and biochemical basis and clinical implications.
	jac.oxfordjournals.org /cgi/content/full/49/5/793 (3966 words)

	Methicillin Resistant Staphylococcus Aureus (MRSA)
		MRSA refers to a type of bacteria (Staphylococcus aureus) that is resistant to many antibiotics.
		The final step is for the laboratory to conduct tests using various antibiotics to determine if the bacteria are resistant (able to withstand or tolerate) or sensitive (susceptible to killing) to select antibiotics.
		Although MRSA cannot be effectively treated with antibiotics such as methicillin, nafcillin, cephalosporin or penicillin, it can usually be treated with an antibiotic called vancomycin.
	www.health.state.ny.us /diseases/communicable/staphylococcus_aureus/methicillin_resistant/fact_sheet.htm (460 words)

	Methicillin-Resistant Staphylococcus aureus (MRSA)-Overview
		MRSA is different from other types of staph because it cannot be treated with certain antibiotics such as methicillin.
		This is because the strains of staph that are known as MRSA do not respond well to many types of antibiotics-the types of medicines that are normally used to kill bacteria.
		When methicillin and other common antibiotic medicines do not work to kill the bacteria that is causing an infection, it becomes harder to get rid of the infection.
	www.webmd.com /hw/infection/tp23380.asp?printing=true (1249 words)

	Controlling methicillin resistant Staphylococcus aureus -- Duckworth 327 (7425): 1177 -- BMJ
		Methicillin resistance was first reported in 1961 shortly after
		Methicillin resistant Staphylococcus aureus clinical strain with reduced vancomycin susceptibility.
		Systematic review of isolation policies in the hospital management of methicillin resistant Staphylococcus aureus: a review of the literature with epidemiological and economic modelling.
	www.bmj.com /cgi/content/full/327/7425/1177 (1207 words)

	GUIDELINES FOR THE CONTROL OF MRSA
		aureus are sensitive to methicillin, cephalosporins, nafcillin and oxacillin.
		In 1959, the first semi-synthetic penicillin, methicillin, was produces by altering the chemical composition of penicillin.
		aureus (methicillin susceptible or resistant) in the anterior nares.
	goapic.org /MRSA.htm (6526 words)

	methicillin (Site not responding. Last check: 2007-10-03)
		A starting point for communities and health-care systems is to assess the extent to which the methicillin were practiced in the United States.
		Interventions reviewed were methicillin single-component (i.e., using only one methicillin to achieve desired outcomes) or multicomponent (i.e., using more than one related activity).
		Interventions were grouped together on the basis of the evidence of effectiveness, studies had to meet these criteria: a) they were limited to primary investigations of interventions to assist populations at high risk, such as low-socioeconomic methicillin and some racial/ethnic groups (14,18,20).
	hometown.aol.com /intopsite789/methicillin.html (241 words)

	Methicillin-Resistant Staphylococcus Aureus in Head and Neck Infections
		The MRSA is a Staphylococcus aureus that is resistant to beta lactam, which includes methicillin, oxacillin, and nafcillin.
		MRSA accounts for up to 61% of all Staphylococcus aureus infections and the majority of these infections occur in the hospital setting; however, it is becoming more common in the community.
		Methicillin resistance is mediated via a chromosomal incorporated resistant gene, which is called mecA gene, which produces a different kind of penicillin-binding protein, interfering with the binding of the beta-lactam antibiotics.
	www.bcm.edu /oto/grand/11_16_06.htm (3592 words)

	Methicillin Resistant Staphylococcus Aureus (MRSA)
		Staphylococcus aureus (SA) is a very common bacteria that can be found in about 3 out of 10 healthy people.
		Methicillin refers to a group of antibiotics that are usually used to treat SA.
		Some SA bacteria are no longer killed by these antibiotics and are called methicillin resistant.
	www.ottawahospital.on.ca /spotlight/mrsa/index-e.asp (636 words)

	Quality Matters (MRSA)
		When it invades normal tissue, Staph can cause illnesses ranging from skin infections to wound infections, pneumonia or sepsis.[1] Like most bacterial infections, those caused by Staph are treated with antibiotics.
		In the 1960s the antibiotic methicillin was commonly used to treat Staph infections.
		Strains of Staph aureus resistant to methicillin (MRSA) soon emerged.[2] MRSA is resistant to all penicillins and cephalosporins.[1] MRSA is also frequently resistant or rapidly develops resistance to other antibiotics including clindamycin, erythromycin, rifampin, tetracycline, trimethoprim/sulfamethoxazole (TMP-SMX), aminoglycosides and fluoroquinolones particularly when these are used as monotherapy.
	mqa.dhs.state.tx.us /QMWeb/MRSA.htm (2018 words)

	IDSA \| Methicillin-resistant Staphylococcus aureus (MRSA) bacteria
		By 2002, that figure had jumped to 57.1 percent, according to data from the Centers for Disease Control and Prevention.
		Staph infections have acquired resistance to many other drugs in addition to methicillin.
		In fact, according to CDC, about half of the identified MRSA strains in U.S. hospitals are resistant to all but a few antibiotics.
	www.idsociety.org /Template.cfm?Section=Antimicrobials&Template=/ContentManagement/ContentDisplay.cfm&ContentID=9716 (218 words)

	Epidemic Methicillin-Resistant Staphylococcus Aureus: Dramatically Increased Risk for Circumcised Newborn Boys
		(2000) reported an outbreak of erythromycin-resistant methicillin sensitive Staphylococcus aureus among circumcised boys in a newborn nursery in North Carolina.
		Emergence of methicillin resistant Staphylococcus aureus (MRSA) bacteraemia among children in England and Wales, 1990-2001.
		Adverse clinical and economic outcomes attributable to methicillin resistance among patients with Staphylococcus aureus surgical site infection.
	www.doctorsopposingcircumcision.org /DOC/mrsa.html (2338 words)

	Genetic Organization of the mecA Region in Methicillin-Susceptible and Methicillin-Resistant Strains of Staphylococcus ...
		A homolog of the Staphylococcus aureus methicillin resistance gene mecA was
		Couto, I., Wu, S. W., Tomasz, A., de Lencastre, H. Development of Methicillin Resistance in Clinical Isolates of Staphylococcus sciuri by Transcriptional Activation of the mecA Homologue Native to the Species.
		Katayama, Y., Ito, T., Hiramatsu, K. Genetic Organization of the Chromosome Region Surrounding mecA in Clinical Staphylococcal Strains: Role of IS431-Mediated mecI Deletion in Expression of Resistance in mecA-Carrying, Low-Level Methicillin- Resistant Staphylococcus haemolyticus.
	jb.asm.org /cgi/content/abstract/180/2/236 (726 words)

	Four Pediatric Deaths from Community-Acquired Methicillin-Resistant Staphylococcus aureus -- Minnesota and North ...
		Since the first case reports of MRSA infections in the United States in 1968 (3), MRSA has become an increasing problem.
		aureus isolates that were methicillin resistant increased from 2% in 1974 to approximately 50% in 1997 (4,5).
		Methicillin resistance is usually conferred by the chromosomal mecA gene, which encodes an altered penicillin-binding protein (PBP-2A) that causes resistance to all beta-lactam antibiotics, including cephalosporins.
	www.cdc.gov /mmwr/preview/mmwrhtml/mm4832a2.htm (1660 words)

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