English: Under a very high magnification of 20,000x, this scanning electron micrograph (SEM) shows a strain of Staphylococcus aureus bacteria taken from a vancomycin intermediate resistant culture (VISA).
Under SEM, one can not tell the difference between bacteria that are susceptible, or multidrug resistant, but with transmission electron microscopy (TEM), VISA isolates exhibit a thickening in the cell wall that may attribute to their reduced susceptibility to vancomycin . See PHIL 11156 for a black and white version of this image. VISA and VRSA are specific types of antimicrobial-resistant staph bacteria. While most staph bacteria are susceptible to the antimicrobial agent vancomycin some have developed resistance. VISA and VRSA cannot be successfully treated with vancomycin because these organisms are no longer susceptibile to vancomycin. However, to date, all VISA and VRSA isolates have been susceptible to other Food and Drug Administration (FDA) approved drugs.
How do VISA and VRSA get their names?
Staph bacteria are classified as VISA or VRSA based on laboratory tests. Laboratories perform tests to determine if staph bacteria are resistant to antimicrobial agents that might be used for treatment of infections. For vancomycin and other antimicrobial agents, laboratories determine how much of the agent it requires to inhibit the growth of the organism in a test tube. The result of the test is usually expressed as a minimum inhibitory concentration (MIC) or the minimum amount of antimicrobial agent that inhibits bacterial growth in the test tube. Therefore, staph bacteria are classified as VISA if the MIC for vancomycin is 4-8µg/ml, and classified as VRSA if the vancomycin MIC is >16µg/ml.
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This media comes from the Centers for Disease Control and Prevention's Public Health Image Library (PHIL), with identification number #11157.
Note: Not all PHIL images are public domain; be sure to check copyright status and credit authors and content providers.
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Content Providers(s): CDC/ Matthew J. Arduino, DRPH
Photo Credit: Janice Haney Carr
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PD-USGov-HHS-CDC
English: None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.
En fausses couleurs et sous un très fort grossissement (x20.000), cette micrographie électronique à balayage (SEM) montre une souche de bactérie ''Staphylococcus aureus'' issue d'une culture antibiorésistante à la vancomycine (VISA)
{{Information |Description={{en|1='''Under a very high magnification of 20,000x, this scanning electron micrograph (SEM) shows a strain of Staphylococcus aureus bacteria taken from a vancomycin intermediate resistant culture (VISA).'''<p> Under SEM, one
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one can not tell the difference between bacteria that are susceptible or multidrug resistant but with transmission electron microscopy TEM VISA isolates exhibit a thickening in the cell wall that may attribute to their reduced susceptibility to vancomycin See PHIL 11156 for a black and white version of this image VISA and VRSA are specific types of antimicrobial resistant staph bacteria While most staph bacteria are susceptible to the antimicrobial agent vancomycin some have developed resistance VISA and VRSA cannot be successfully treated with vancomycin because these organisms are no longer susceptibile to vancomycin However to date all VISA and VRSA isolates have been susceptible to other Food and Drug Administration FDA approved drugs How do VISA and VRSA get their names Staph bacteria are classified as VISA or VRSA based on laboratory tests Laboratories perform tests to determine if staph bacteria are resistant to antimicrobial agents that might be used for treatment of infections For vancomycin and other antimicrobial agents laboratories determine how much of the agent it requires to inhibit the growth of the organism in a test tube The result of the test is usually expressed as a minimum inhibitory concentration MIC or the minimum amount of antimicrobial agent that inhibits bacterial growth in the test tube Therefore staph bacteria are classified as VISA if the MIC for vancomycin is 4 8µg ml and classified as VRSA if the vancomycin MIC is gt 16µg ml wnthi ph s 2544aehlngthima This media comes from the Centers for Disease Control and Prevention s Public Health Image Library PHIL with identification number 11157 Note Not all PHIL images are public domain be sure to check copyright status and credit authors and content providers العربية Deutsch English makedonski slovenscina phusrangsrrkh Content Providers s CDC Matthew J Arduino DRPH Photo Credit Janice Haney Carrkarxnuyat karichiflniihm PD USGov HHS CDC English None This image is in the public domain and thus free of any copyright restrictions As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image Public domain Public domain false falseThis image is a work of the Centers for Disease Control and Prevention part of the United States Department of Health and Human Services taken or made as part of an employee s official duties As a work of the U S federal government the image is in the public domain eesti Deutsch cestina espanol portugues English francais Nederlands polski slovenscina suomi makedonski ukrayinska 日本語 中文 中文 台灣 中文 简体 中文 繁體 العربية khabrryayodyyxithyephimkhabrryaythrrthdediywephuxkhyaykhwamwaiflnimixairfrngessEn fausses couleurs et sous un tres fort grossissement x20 000 cette micrographie electronique a balayage SEM montre une souche de bacterie Staphylococcus aureus issue d une culture antibioresistante a la vancomycine VISA ixethmthiaesdngxyuiniflniprakxbdwyStaphylococcus aureuswnthisrang wnkxtng2001 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