Growth factors X and V are essential in the cultivation of:

A small gram-negative rod has been isolated from the blood. It grows on chocolate agar, but not on sheep blood agar. There is no growth surrounding the X or V disk, but there is growth around the XV disk. The organism is most likely:

An alpha Streptococcus has been isolated from urine, and it hydrolyzes esculin. To which serological group of streptococci does this organism belong?

Which of the following would best enhance the growth of pathogenic Neisseria species?

The organisms identified as alpha Streptococcus-Enterococcus group can be identified by which of the following set of biochemical media and/or test:

A flat, purple colony with a metallic sheen on EMB is probably:

Pseudomonas species:

Pseudomonas aeruginosa is probably test identified by its characteristic:

The genus that shows characteristic “swarming” on agar media is:

In the TSI determination, Pseudomonas aeruginosa will show an:

Most Escherichia coli will show the following requirement:

Biochemically, a stool culture isolate appears to be a Salmonella sp, but it fails to agglutinate with Salmonella antisera. Therefore, one should:

A wound culture yields a gram-negative rod that produces an acid butt and slant on TSI and is oxidase positive. This is most likely:

Urine cultures are inculated onto colistin-nalidixic acid agar (CNA and (MAC MacConkey’s. What purpose does the CNA serve?

Salmonella and Shigella species are always:

All species of Proteus react positively in the:

Some strains of this genus are chromogenic and produce pink-red amber color:

The family Enterobacteriaceae are:

On S-S agar, Shigella species are:

In the test for the enzyme nitrate reductase, the addition of zinc dust is useful because:

A 1% aqueous solution of teramethyl-para-phenylene-diamine dihydrochloride is used in testing bacterial colonies for the production of:

The Voges-proskauer test is used for detecting the production of:

The reaction on urease agar test medium depends on the hydrolysis of urea, which is in turn dependent on the:

The H (spreading )antigen are this type:

A gram-negative rod has been isolated from feces, and the confirmed biochemical reactions fit those of Shigella. The organism does not agglutinate in Shigella antisera. What should be done next?

After 10 minutes in boiling water, Escherichia coli was killed, but Bacillus subtilis was found to survive. Which of the following provides the most probably explanation?

A gram-negative rod which is an obligate anaerobe is:

Which of the following will not grow in most artificial laboratory media?

All of the following are bacilli except:

A pathogenic spirochete from the genus ______ causes _______.

Strict anaerobes are in the genus:

A double zone of hemolysis on blood agar is characteristic of:

A strict anaerobe with “typical” terminal, drumstick spores is:

On MacConkey’s agar, Klebsiella is:

Which two genera deaminate phenylalanine:

Spreading surface growth with typical fruity odor is characteristic for:

Using the API system, oxidase negative organisms are suspended in:

The reagent used for the indole test is:

In the API system, like many other testing systems, fermentation of sugars is indicated by:

In the API system, like many other testing systems, H2S is indicated by:

An enteric gram-negative rod producing colorless colonies on EMB or MacConki’s agar and a red sland and yellow butt and no gas on TSI might be a:

A gram-negative rod produces a yellow butt and red slant on LIA. The genus most likely represented is:

The microbe that causes acute bacterial meningitis is usually aquired:

All of the following organisms except one, are normal inhabitants of the upper respiratory tract:

All the organisms listed below can be encountered in an infected throat except:

Bacterial meningitis is accompanied by a cerebrospinal fluid that:

The typical infection produced by Staphylococcus aureus is:

A spinal fluid has been brought to the laboratory; the diagnosis is meningitis. The direct gram stain shows gram-positive cocci in pairs. Which of the following organisms might this be?

Which of the following organisms are considered normal flora of the blood or spinal fluid?

Whooping cough is confimed by the isolation of:

In an improperly made gram stain of spinal fluid from an infant with Listeric Meningitis, the organism may be confused with?

The most common cause of furuncles and carbuncles is:

IT is the enterotoxin produced by Staphylococcus aureus which causes:

The best time to draw a blood culture is:

Normally, the bloodstream:

A common laboratory contaminant is:

In subacute bacterial endocarditis, the most likely causative agent is:

Pseudomonas aeruginosa, an organism that is found in a variety of natural and domestic environments is:

The number of organisms in a urine sample from infected individuals is of most significance in that most infected urine samples show colony counts of:

If when doing a urine culture, you find 146 colonies on the agar plate media, how many organisms are present per ml or urine?

The genus which causes dysentery is:

The organism that causes Legionnaire’s Disease is:

Humans become infected by Pasteurella multocida organisms most frequently from:

The scientific name for the organism that causes syphilis is:

The family, Enterobacteriaceae:

Of the following body sites, the only one to have a normal flora is the:

A coliform that is a normal inhavitant of the large intestine is:

The most often acquired noocomial infection involves the ______ and is caused by _____.

The genus of anaerobic bacteria that is predominant in the large instestine is:

Which of the following materials is most frequently found to be positive on culture:

Bubonic plague is caused by:

Listeria monocytogenes has been shown to be the causative agent in:

One of the ways antibiotics work against pathogens is to:

In the micro-titer well serial dilution method for determining the susceptibility of an organism to antibiotics the:

The organism that causes syphilis cannot:

The organisms that cause typhus fever are:

_____ produces ______ that causes flaccid paralysis when it is eaten in improperly preserved food.

The most common type of food poisioning in this country is caused by:

The standard determination of antibiotic sensitivities that involves the diffusion of the drugs from disks placed on agar is called:

A zone of inhibition of growth on a plate containing a certain antibiotic indicates that:

1/1000; 1/10000, and 1/1000000 dilutions of a drug are made and inoculated with standard suspension of a test organism. If growth is seen only in the third and fourth tubes the:

Disk diffusion susceptibility plates should be read:

A broad-spectrum antibiotic will be active against:

Bacteria that produce penicillinase may be killed by:

Which of the following factors would make an organism appear to be more resistant on a disk diffusion susceptibility test:

N. asteroides generally survives the decontamination of sputum for mycobacterial culture; it, therefore, may grow out on:

In Gram stains of sputum from a patient with nocardiosis, the organism will appear as:

The Kinyoun cabolfuchsin method is used to stain:

Acid-fast bacteria belong to which of the following genera:

Mycobacterium tuberculosis:

Herpes viruses cause all of the following infections except:

Herpes simplex 2 (HSV-2 infections:

The cells that are destroyed in AIDS are ____ and their loss leaves the patient vulnerable to _____.

Which of the following is most often used to prepare a slide from a plate culture of a dermatophyte for microscopic observation?

Cultures for fungi are grown at:

A mass of intertwined and branching hyphae is called:

A good method of identifying Cryptococcus neoformans is the:

India ink wet mounts are used to demonstrate:

In cultureing sptum for M. tuberculosis, the following digestion and decontamination method is preferred:

T.B. cultures should be incubated for a minimum of: