Exam 41: Mycobacteria

Quality control is performed to test the validity of catalase production at 68°C.M.fortuitum and M.tuberculosis are used,which yield a positive and negative reaction,respectively.Which one of the following statements explains this discrepancy?

Acid-fast smears should be examined carefully by scanning at least ________ oil immersion fields.

The stain that does not require heating the slide for better penetration of stain into the mycobacterial cell wall is known as the:

The 3-day test that is useful for identifying the rapid-growers,M.fortuitum and M.chelonae,and that measures the rate by which this enzyme breaks down phenolphthalein disulfate into phenolphthalein and other salts is the ____________ test.

The recent emergence of epidemic multidrug-resistant strains of M.tuberculosis,in conjunction with the end of the downward trend of reported cases of tuberculosis in the United States,has been largely attributed to:

The most commonly isolated mycobacterium in the United States is:

Optimal conditions for most mycobacterial cultures are:

Characteristics that are found in the bacteria called Mycobacterium are:

The nonpathogenic Mycobacterium commonly found in tap water,which has been a problem when tap water or deionized water has been used in the preparation of smears,is:

The Runyon system of classification is based on:

Which of the following species of Mycobacterium causes a chronic disease of the skin,mucous membranes,and nerve tissue but has not yet been cultivated in vitro?

Known to cause an inflammatory bowel disease referred to as Johne's disease in cattle,sheep,and goats,which organism has been isolated from the bowel mucosa of patients with Crohn disease?

In the identification of mycobacterial isolates,the niacin test involves the:

The first test that is always performed on organisms growing on solid or liquid mycobacterial media is a(n):

In the identification of mycobacterial isolates,the catalase test involves the:

Under what circumstance might slow-growing mycobacteria appear to produce colonies in a few days?

Slow-growing NTM whose colonies produce no pigment,whether they are grown in the dark or the light,are referred to as:

The specimens of choice for detecting nontuberculous mycobacterial disease are:

Slow-growing NTM whose colonies become pigmented when exposed to light are referred to as:

Optimal conditions for the recovery of M.haemophilum from specimens include: