VISA (mikrobiologia)
 | Ten artykuł od 2012-02 wymaga zweryfikowania podanych informacji. |
 Mikrografia elektronowa kultury gronkowca złocistego ze szczepu VISA | |||
| Systematyka | |||
| Domena | |||
|---|---|---|---|
| Typ | |||
| Klasa | Bacilli | ||
| Rząd | Bacillales | ||
| Rodzina | Staphylococcaceae | ||
| Rodzaj | Staphylococcus | ||
| Gatunek | Gronkowiec złocisty | ||
| Podgatunek | VISA | ||
| Nazwa systematyczna | |||
| Staphylococcus aureus F. J. Rosenbach, 1884 | |||
| Synonimy | |||
| |||
VISA (ang. vancomycin-intermediate Staphylococcus aureus czyli Staphylococcus aureus średniooporny na wankomycynę) – szczep gronkowca złocistego ze zmniejszoną wrażliwością na działanie antybiotyku wankomycyny.
Zobacz też
- VRSA (gronkowiec złocisty oporny na wankomycynę)
- MRSA (gronkowiec złocisty oporny na metycylinę)
- MSSA (gronkowiec złocisty wrażliwy na metycylinę)
- PSSA (gronkowiec złocisty wrażliwy na penicylinę)
Przeczytaj ostrzeżenie dotyczące informacji medycznych i pokrewnych zamieszczonych w Wikipedii.
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Autor: (of code) -xfi-, Licencja: CC BY-SA 3.0
The Wikispecies logo created by Zephram Stark based on a concept design by Jeremykemp.
The Star of Life, medical symbol used on some ambulances.
Star of Life was designed/created by a National Highway Traffic Safety Administration (US Gov) employee and is thus in the public domain.Under a very high magnification of 50,000x, 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 11158 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.