Is varicella zoster Gram positive or negative?
The most common complication of chickenpox is secondary skin infection, usually with a Gram-positive organism. Rarer complications include infection of the central nervous system (CNS). In the immunocompromised host, lesion formation is longer than with the immunocompetent host.
What specimen can be used for isolation of anaerobic bacteria?
Materials appropriate for anaerobic culture include blood specimens, aspirates of body fluids (pleural, pericardial, cerebrospinal, peritoneal, and joint fluids), urine collected by suprapubic aspiration, abscess contents, deep wound aspirates, and specimens obtained by special procedures such as transtracheal …
Which one of the following pathogenic anaerobic bacteria is most frequently isolated in clinical laboratories?
Bacteroides fragilis group (67, 19.9%) were the most commonly isolated anaerobic pathogens.
How do you collect anaerobic culture?
Collection of liquid or purulent specimens.
- Collect specimen from deep within the wound with sterile syringe and needle.
- Peel apart package and remove transport.
- Inject up to 5 ml of fluid into the transport media through the rubber port.
- Transport to the laboratory.
What does a positive varicella zoster antibody test mean?
A positive IgG result indicates the presence of antibodies to varicella zoster virus. – The test cannot distinguish between past infection and current infection though, so a positive result could indicate active infection and not immunity.
How do you read varicella zoster results?
0.8 AI or less: Negative – No significant level of detectable varicella- zoster IgG antibody. 0.9-1.0 AI: Equivocal – Repeat testing in 10-14 days may be helpful. 1.1 AI or greater: Positive – IgG antibody to varicella-zoster detected, which may indicate a current or past exposure/immunization to varicella-zoster.
How do you identify anaerobic organisms?
Aerobic and anaerobic bacteria can be differentiated by culturing them in test tubes of thioglycollate broth: 1: Obligate aerobes need oxygen because they cannot ferment or respire anaerobically. They gather at the top of the tube where the oxygen concentration is highest.
How can you tell if bacteria is aerobic or anaerobic?
Aerobic and anaerobic bacteria can be identified by growing them in test tubes of thioglycollate broth:
- Obligate aerobes need oxygen because they cannot ferment or respire anaerobically.
- Obligate anaerobes are poisoned by oxygen, so they gather at the bottom of the tube where the oxygen concentration is lowest.
What chronic infection is caused by anaerobic bacteria?
Anaerobic organ infections include, but are not restricted to, brain abscesses, dental infections, aspiration pneumonia, lung abscesses, bite infections (animal/human), abdominal abscesses, and necrotizing infections of soft tissue.
What does anaerobic culture test for?
What is this test? This test looks for certain types of bacteria in a wound or a fluid sample from an infection site. These bacteria are called anaerobic because they don’t need oxygen to grow. An anaerobic culture means the test is done without letting oxygen get to the sample.
How do you test for anaerobic bacteria?
The identification of anaerobic bacteria involves the determination of cellular morphology, colonial characteristics on blood agar, and biochemical characteristics. In addition, the clostridia are tested for toxin production and, where necessary, the toxin is identified by toxin neutralization tests.