Exam 22: Anaerobes of Clinical Importance

An elderly patient in a nursing home is recovering from bacterial pneumonia.The patient has been on a lengthy regiment of antibiotics to kill the organism causing the disease.A few days later, the patient is diagnosed with pseudomembranous colitis.What organism is the most likely cause?

What are two important factors that must be taken into consideration when transporting specimens for anaerobic culture?

What disk is used to presumptively identify Peptostreptococcus anaerobius?

What evidence indicates the presence of anaerobes in cultures?

How long are anaerobic cultures routinely held in the laboratory?

Gram stains of specimens for anaerobic cultures should be examined for all the following reasons except:

All of the following organisms are found on the skin under normal conditions except:

How is the true Gram stain reaction of an anaerobe determined?

All of the following reasons are cited for performing antimicrobial susceptibility testing on anaerobes by the Clinical and Laboratory Standards Institute (CLSI) except to:

All of the following are non-spore-forming, anaerobic, gram-positive bacilli except:

An obligate anaerobe is an organisms that:

What organism mostly commonly causes gas gangrene?

A microbiology technologist is reading an anaerobic plate from an intestinal abscess.There is growth on the Bacteroides bile esculin (BBE) plate: gray colonies with a brown color in the area around the colonies.There is also a dark precipitate in the medium in the areas of heavy growth.The microbiologist Gram stains the colonies and observes gram-negative coccobacilli.What is the presumptive identification of this organism?

What substances do organisms that use oxygen have to protect themselves from superoxide anions?

What disease does Clostridium tetani cause?

What type of bacteria are in the genus Clostridium?

All the following organisms are found in the gastrointestinal (GI) tract except:

Bacterial growth requirements for oxygen and carbon dioxide can be divided into all the following categories except:

How are suspected colonies of anaerobes processed?

What disease does Clostridium botulinum cause?