Term
| In addition to bacteremia and endocarditis in immunocompromised and IV drug abusers, this organism has been associated with clenched fist wounds, human bite infections, and cellulitis associated with “skin popping”. It may pit the agar and has a bleach smell. |
|
Definition
|
|
Term
| This organism is associated with bacteremia, endocarditis, and joint and bone infections primarily in children and immunocompromised; source is upper respiratory tract; this species may be confused with GC because it can grow on MTM, appears as Gram-negative cb, and is oxidase, glucose and pro positive (it may be differentiated by its positive nitrate reaction). |
|
Definition
|
|
Term
| Associated with SBE and septicemia related to GU (UTI) or intraabdominal infections, this organism is PYR, bile esculin and 6.5% NaCl positive. |
|
Definition
|
|
Term
| Most often associated with IV catheter-associated bacteremia due to its ability to produce a biofilm or “slime”, organism is catalase positive, coagulase negative and negative for trehalose and mannitol. |
|
Definition
| Staphylococcus epidermidis |
|
|
Term
| This organism is gram-negative and may appear as dashes and dots; it may produce star shapes in the center of its colonies; it may cause peridontal infections or endocarditis. |
|
Definition
| Aggregatibacter actinomycetemcomitans |
|
|
Term
| This organism is the most common cause of lobar pneumonia and meningitis in adults and can be isolated in the blood of 40-50% of patients with infections. It is sensitive to ethylhydrocupreine HCl and bile soluble. |
|
Definition
|
|
Term
| This organism is a cause of meningitis in young adults, may spread through the blood, associated with petechiae, and is a problem in persons with deficiencies in late components of complement. It is oxidase + and positive for glucose and maltose as well as gamma glutamyl-aminopeptidase (GGT). |
|
Definition
|
|
Term
| This organism is an important cause of septicemia which may lead to endocarditis or pneumonia; it's origin is often foci, such as cellulitis, abscesses and osteomyelitis; it is Gram-positive, catalase postitive, and coagulase positive. |
|
Definition
|
|
Term
| This is the most common negative rod isolated from the blood and usually originates from a UTI. It produces pink colonies with precipitated bile on MAC; it is A/A on KIA, indole positive, and LDC (lysine decarboxylase) positive |
|
Definition
|
|
Term
| This organism is the most common anaerobe isolated from blood cultures and associated with intrabdominal infections especially when the intestine is ruptured. It is resistant to antimicrobial disks, grows in 20% bile, is catalase +, and indole negative. |
|
Definition
|
|
Term
| This organism is the most common cause of subacute bacterial endocarditis and is optochin resistant and bile insoluble. |
|
Definition
|
|
Term
| Associated undulent fever, lysis centrifugation or biphasic media recommended, should hold cultures at least 21 days, requires CO2 for initial isolation, small negative coccobacilli, oxidase +, thionine sensitive and fuchsin resistant. |
|
Definition
|
|
Term
| Normal flora in the oral cavity, associated with peridontal disease and occassionally endocarditis; it is gram-negative with tapered (fusiform) ends (or one tapered and one rounded) and produces swarming or outgrowths on SBA due to its "gliding" motility. |
|
Definition
| Capnocytophaga gingivalis |
|
|
Term
| Transmitted rat bites, produces "string of pearls" morphology on GS, "fluff balls" in blood culture (liquid) media and "fried egg" or embedded colonies on agar |
|
Definition
| Streptobacillus moniliformis |
|
|
Term
| This organism is associated almost exclusively with endocarditis especially in patients with anatomic heart defects; it is Gram-negative and tear-drop, dumb-bell, or lollipop shaped (swollen at one or both ends) on GS; and produces colonies that are slightly alpha and may pit the agar |
|
Definition
|
|
Term
| The most common nonfermenter isolated from the blood, which is seen in immunosuppressed patients; it produces pyocyanin pigment, has a grape (or tortilla chip) odor, and is oxidase positive and indole negative. |
|
Definition
|
|
Term
| Associated with endocarditis in immunocompromised patients, transmitted from cats; isolated best from blood using lysis centrifugation (Isolator system) and plating onto fresh blood agar; colonies resemble "cauliflowers"; curved GNB with "twitching" motility, negative oxidase and catalase. |
|
Definition
|
|
Term
| This organism is acquired by contact with animal urine and is associated with Weil's syndrome; it is isolated in Fletcher's media, incubated in the dark at room temperature for up to 6 weeks; it is a spirochete with corkscrew motility and hooked ends. |
|
Definition
|
|
Term
| This small Gram-positive rod, which may produce palisading and Chinese letters, may cause bacteremia, IV catheter infections, or prosthetic valve infections in immunocompromised patients. |
|
Definition
|
|
Term
| Suspect this organism when a Gram + cocci is seen on the GS from a positive blood culture which does not grow on SBA: since it requires thiol or pyridoxal (Vitamin B6) for growth it will grow on supplemented agar or agar to which a pyridoxal disk has been added or using the Staph cross streak technique (it will satellite around the Staph) |
|
Definition
| Abiotrophia sp and Granulicatella sp( Nutritionally variant streptococci) |
|
|
