Aerobic Gram-Negative Bacteria

question

Generally, vanco is active against gram-positive bacteria. However, what is more likely to exhibit resistance?

answer

E. gallinarum

question

The enterotoxins of both Vibrio Cholerae O1 and noninvasive (toxigenic) strains of E. coli produce serious diarrhea by what mechanism?

answer

Stimulation of andenylate cyclase, which gives rise to excessive fluid secretion by the cells of the small intestine

question

Colonies of Neisseria sp. turn color when a redox regent if applied. The color change is indicative of the activity of the bacterial enzyme

answer

cytochrome oxidase

question

An environmental sampling study of respiratory therapy equipment produced cultures of a yellow, nonfermentative (at 48 hours), gram-negative bacillus from several of the nebulizers, which would most likely be species of

answer

chryseobacterium

question

The characteristics of being lactose negative, citrate negative, urease negative, lysine decarboxylase negative, and nonmotile best describes which organism?

answer

S. dysenteriae

question

A fermentative gram-negative bacillus that is oxidase positive, motile and grows well on MacConkey agar is

answer

A hydrophilia

question

Fecal cultures are inoculated on thio specifically for the isolation of

answer

vibrio

question

The causative agent of meliodosis is

answer

B. pseudomallei

question

Which miroorganism will grow only on culture media supplemented with either cysteine or cystine?

answer

f. tularensis

question

A test that could be used to screen for enterohemorrhagic E. coli?

answer

MUG

question

An example of an oxidase-positive, glucose fermenting organism is

answer

P. aeruginosa

question

A nonlactose fermenter is isolated from a stool specimen. A biochemical multitest assay Ids the isolate as shigella. Subsequently, the isolate demonstrates agglutination in shigella group B antisera. What is most likely?

answer

The isolate is shigella flexneri

question

The species of vibrio closely associated with rapidly progressing wound infections seen in patients with underlying liver disease is

answer

V. vulnificus

question

The haemophilus influenzae vaccine protects against which serotype?

answer

serotype b

question

Salmonella Typhi exhibits a characteristic biochemical pattern, which differentiates it from other salmonellae. What is a characteristic of S. Typhi?

answer

Agglutination in Vi grouping serum

question

The sexually acquired disease characterized by genital ulcers and tender inguinal lymphadenopathy, which is caused by a small gram-negative bacillus is known as

answer

chancroid

question

Which disease is most likely to be acquired from a hot tub?

answer

pseudomonas dermatitis

question

Campylobacter spp. are associated most frequently with cases of

answer

gastroentitis

question

An organism occasionally misidentified as an enteric pathogen because some isolates produce H2S is

answer

citrobacter

question

An important characteristic of neisseria gonorrhoeae or the infection it produces is

answer

asymptomatc infections are common in females

question

A physician orders a urea breath test; she must suspect an infection caused by

answer

H. pylori

question

What nonfermenters is rarely isolated in the US?

answer

B. mallei

question

Erythromycin eye drops are routinely administered to infants to prevent infections caused by

answer

N. gonorrhoeae

question

Neisseria lactamica closely resembles neisseria meningitidis but can be differentiated from it by its ability to metabolize

answer

lactose

question

A causative agent of the form of conjunctivitis known as pinkeye is

answer

H. aegyptius

question

cronobacter spp. have frequently been linked to

answer

infections in infants due to contaminated formula

question

Acinetobacter baumannii

answer

is oxidase negative

question

Id the fermentative agent that may infect reptiles and fish as well as humans when they are exposed to contaminated soil or water

answer

aeromonas

question

Campylobacter jejuni is

answer

hippurate hydrolysis positive

question

The method of serogrouping Shigella used in the clinical laboratory is based on

answer

O antigens

question

The symptom of diffuse, watery diarrhea that produces a relatively clear stool containing mucus flecks is suggestive of an infection caused by

answer

vibrio cholerae

question

An example of a halophilic microorganism is

answer

V. parahaemolyticus

question

What describes acinetobaceter?

answer

infections associated with use of medical devices

question

Explosive watery diarrhea with severe abdominal pain after eating raw shellfish is most characteristic of infection caused by

answer

Vibrio parahemolyticus

question

An unheated suspension of salmonella typhi typically produces agglutination of Vi antisera. After heating the same suspension, agglutination will occur in which grouping sera?

answer

question

The species of campylobacter noted to produce septicemia, septic arthritis, meningitis, jaundice with hepatosplenomegaly, and thrombophlebitis in debilitated patients is

answer

C. fetus

question

A positive Voges-Proskauer reaction is characteristic of

answer

E. aerogines

question

The classic toxigenic strains of which serogroup are implicated in epidemic infections of vibrio cholerae?

answer

question

Brucella are

answer

intracellular pathogens

question

Yersinia pestis is characteristically

answer

urease negative

question

Lack of motility is characteristic of

answer

K. oxytoca

question

A blood culture of a patient with endocarditits yields aggregatibacter aphrophilus. What is the likely source of this patients infection?

answer

endogenous from the oral cavity

question

Isolation of Neisseria gonorrhoeae

answer

requires incubation under increased CO2

question

A positive indole reaction is characteristic of

answer

E. coli

question

What organism will produce a yellow slant and a yellow butt on TSI agar after incubating for 18 hours?

answer

E. coli

question

Pyocyanin is characteristically produced by

answer

Pseudomonas aeruginosa

question

Color Plate 26 shows the Gram stain of a CSF from a 1-y.o. girl suspected of having meningitis. After 24 hours of growth, small tan colonies were isolated on chocolate agar incubated in CO2 has no growth. What organism should be suspected?

answer

Haemophilus influenzae

question

What organism will turn a dark purple when tetramethyl-p-phenylenediamine hydrochloride is applied?

answer

M. catarrhalis

question

Cardiobacterium hominis has been recovered as an etiologic agent from cases of endocarditis. An identifying characteristic of the organism is

answer

positive oxidase

question

Vibrio vulnificus is a well-established human pathogen that is known to cause

answer

wound infections

question

Which organism produces a positive phenylalanine deaminase reaction?

answer

providendia stuartii

question

All members of the pseudomonas fluorescent group are noted for producing

answer

pyroverdin

question

What is the optimal clinical specimen for the recovery of legionella pneumophila?

answer

bronchial washings

question

Production of a yellow pigment on nutrient or SBA is characteristic of which member of the Enterobaceriaceae family?

answer

C. sakazakii

question

A gram-negative bacillus was recovered from the urine of a child with recurrent UTI's. The organism was oxidase negative, lactose negative, urease positive and motile. The most likely ID of this agent would be

answer

P. mirabilis

question

Acinetobacter baumanii complex is characteristically

answer

able to grow on macconkey agar

question

What is a characteristic of eikenella corrodens?

answer

its found in the mouth and upper respiratory tract of humans

question

Which species of pasteurella is associated with human infections following cat bites?

answer

P. multocida

question

Which species of legionella is positive for hippurate hydrolysis?

answer

L. pneumophilia

question

What is a characteristic of haemolphilus aegyptius?

answer

Requires X and V factors

question

Kingella dentrificans can be diffrentiated from N. gonorrhoeae because it is

answer

able to reduce nitrate

question

Which member of the family enterobacteriaceae is oxidase postive?

answer

plesiomonas

question

In the past, povidone iodine, tincture of iodine prep pads and swabs, and other disinfectants have been recalled because of microbial contamination. The most likely organism to be isolated in these cases is

answer

P. aeruginosa

question

Foodborne outbreaks of brucellosis are most commonly associated with eating

answer

imported cheese

question

Serratia are unique in the family of enterobacteriaceae because of their ability to produce extracellular hydrolytic enzymes. Which is produced by serratia species?

answer

DNase

question

The optimal specimen for the recovery of Bordetella pertussis is

answer

nasopharyngeal swab

question

Blood cultures are recommended for the recovery of which of the following organisms?

answer

Brucella canis

question

CIN agar is recommended for the recovery of

answer

Yersinia enterocolitica

question

Why are cultures for Gardnerella vaginalis not recommended?

answer

isolation of the bacteria may not be clinically signficant

question

Buffered charcoal yeast extract agar is the recommended medium for the recovery of

answer

Legionella pneumophila

question

A number of vacationers who have traveled outside the US have had their vacations interrupted by a case of "travelers diarrhea," which is commonly associated with which etiologic agent?

answer

E. coli

question

Bacteria-producing clear colonies with black centers on Hektoen-enteric agar were isolated from a stool culture from a patient with diarrhea. What etiologic agent is it?

answer

salmonella

question

Which Neisseria spp. produces acid from glucose and maltose but not sucrose or lactose?

answer

N. meningitidis

question

The causative agent of the septicemic, hemolytic disease known as Oroya fever is

answer

B. bacilliformis

question

Lack of motility is a characteristic of

answer

klebsiella

question

Violet-colored colonies are typically produced by

answer

C. violaceum

question

Edwardsiella tarda is occasionally isolated in stool specimens and can be biochemically be confused with

answer

salmonella

question

The porphyrin test determines an organisms requirement for

answer

Hemin

question

What is an occasional cause of respiratory tract infections and is rapidly urea positive?

answer

B. bronchiseptica

question

The most common etiologic agent of community-acquired complicated cases of cystitis is

answer

E. coli

question

Association with faucet aerators and humidifiers used with ventilators in ICUs is commonly a factor in outbreaks of infections with which microorganism?

answer

P. aeruginosa

question

The selective nature of HE agar is due to the inclusion of what?

answer

bile salts

question

When performing the oxidase test, which would be appropriate?

answer

colonies from SBA can be used

question

The porphyrin test is most useful for the identification of which organism?

answer

Haemophilis

question

What is the best screening medium for identifying enterohemorrhagic E. coli?

answer

MacConkey agar with sorbitol

question

A young man developed keratitis associated with the use of contact lenses that had been immersed on a contaminated cleaning solution. The most common bacterial etiologic agent in such cases is

answer

P. aeruginosa

question

NYC agar was developed for the isolation of

answer

N. gonorrhoreae

question

Besides P. aeruginosa, what is an important cause of lower respiratory infections in patients with cystic fibrosis?

answer

Burkholdia cepacia

1 of 88

question

Generally, vanco is active against gram-positive bacteria. However, what is more likely to exhibit resistance?

answer

E. gallinarum

question

The enterotoxins of both Vibrio Cholerae O1 and noninvasive (toxigenic) strains of E. coli produce serious diarrhea by what mechanism?

answer

Stimulation of andenylate cyclase, which gives rise to excessive fluid secretion by the cells of the small intestine

question

Colonies of Neisseria sp. turn color when a redox regent if applied. The color change is indicative of the activity of the bacterial enzyme

answer

cytochrome oxidase

question

answer

chryseobacterium

question

The characteristics of being lactose negative, citrate negative, urease negative, lysine decarboxylase negative, and nonmotile best describes which organism?

answer

S. dysenteriae

question

A fermentative gram-negative bacillus that is oxidase positive, motile and grows well on MacConkey agar is

answer

A hydrophilia

question

Fecal cultures are inoculated on thio specifically for the isolation of

answer

vibrio

question

The causative agent of meliodosis is

answer

B. pseudomallei

question

Which miroorganism will grow only on culture media supplemented with either cysteine or cystine?

answer

f. tularensis

question

A test that could be used to screen for enterohemorrhagic E. coli?

answer

MUG

question

An example of an oxidase-positive, glucose fermenting organism is

answer

P. aeruginosa

question

answer

The isolate is shigella flexneri

question

The species of vibrio closely associated with rapidly progressing wound infections seen in patients with underlying liver disease is

answer

V. vulnificus

question

The haemophilus influenzae vaccine protects against which serotype?

answer

serotype b

question

Salmonella Typhi exhibits a characteristic biochemical pattern, which differentiates it from other salmonellae. What is a characteristic of S. Typhi?

answer

Agglutination in Vi grouping serum

question

The sexually acquired disease characterized by genital ulcers and tender inguinal lymphadenopathy, which is caused by a small gram-negative bacillus is known as

answer

chancroid

question

Which disease is most likely to be acquired from a hot tub?

answer

pseudomonas dermatitis

question

Campylobacter spp. are associated most frequently with cases of

answer

gastroentitis

question

An organism occasionally misidentified as an enteric pathogen because some isolates produce H2S is

answer

citrobacter

question

An important characteristic of neisseria gonorrhoeae or the infection it produces is

answer

asymptomatc infections are common in females

question

A physician orders a urea breath test; she must suspect an infection caused by

answer

H. pylori

question

What nonfermenters is rarely isolated in the US?

answer

B. mallei

question

Erythromycin eye drops are routinely administered to infants to prevent infections caused by

answer

N. gonorrhoeae

question

Neisseria lactamica closely resembles neisseria meningitidis but can be differentiated from it by its ability to metabolize

answer

lactose

question

A causative agent of the form of conjunctivitis known as pinkeye is

answer

H. aegyptius

question

cronobacter spp. have frequently been linked to

answer

infections in infants due to contaminated formula

question

Acinetobacter baumannii

answer

is oxidase negative

question

Id the fermentative agent that may infect reptiles and fish as well as humans when they are exposed to contaminated soil or water

answer

aeromonas

question

Campylobacter jejuni is

answer

hippurate hydrolysis positive

question

The method of serogrouping Shigella used in the clinical laboratory is based on

answer

O antigens

question

The symptom of diffuse, watery diarrhea that produces a relatively clear stool containing mucus flecks is suggestive of an infection caused by

answer

vibrio cholerae

question

An example of a halophilic microorganism is

answer

V. parahaemolyticus

question

What describes acinetobaceter?

answer

infections associated with use of medical devices

question

Explosive watery diarrhea with severe abdominal pain after eating raw shellfish is most characteristic of infection caused by

answer

Vibrio parahemolyticus

question

An unheated suspension of salmonella typhi typically produces agglutination of Vi antisera. After heating the same suspension, agglutination will occur in which grouping sera?

answer

question

The species of campylobacter noted to produce septicemia, septic arthritis, meningitis, jaundice with hepatosplenomegaly, and thrombophlebitis in debilitated patients is

answer

C. fetus

question

A positive Voges-Proskauer reaction is characteristic of

answer

E. aerogines

question

The classic toxigenic strains of which serogroup are implicated in epidemic infections of vibrio cholerae?

answer

question

Brucella are

answer

intracellular pathogens

question

Yersinia pestis is characteristically

answer

urease negative

question

Lack of motility is characteristic of

answer

K. oxytoca

question

A blood culture of a patient with endocarditits yields aggregatibacter aphrophilus. What is the likely source of this patients infection?

answer

endogenous from the oral cavity

question

Isolation of Neisseria gonorrhoeae

answer

requires incubation under increased CO2

question

A positive indole reaction is characteristic of

answer

E. coli

question

What organism will produce a yellow slant and a yellow butt on TSI agar after incubating for 18 hours?

answer

E. coli

question

Pyocyanin is characteristically produced by

answer

Pseudomonas aeruginosa

question

answer

Haemophilus influenzae

question

What organism will turn a dark purple when tetramethyl-p-phenylenediamine hydrochloride is applied?

answer

M. catarrhalis

question

Cardiobacterium hominis has been recovered as an etiologic agent from cases of endocarditis. An identifying characteristic of the organism is

answer

positive oxidase

question

Vibrio vulnificus is a well-established human pathogen that is known to cause

answer

wound infections

question

Which organism produces a positive phenylalanine deaminase reaction?

answer

providendia stuartii

question

All members of the pseudomonas fluorescent group are noted for producing

answer

pyroverdin

question

What is the optimal clinical specimen for the recovery of legionella pneumophila?

answer

bronchial washings

question

Production of a yellow pigment on nutrient or SBA is characteristic of which member of the Enterobaceriaceae family?

answer

C. sakazakii

question

answer

P. mirabilis

question

Acinetobacter baumanii complex is characteristically

answer

able to grow on macconkey agar

question

What is a characteristic of eikenella corrodens?

answer

its found in the mouth and upper respiratory tract of humans

question

Which species of pasteurella is associated with human infections following cat bites?

answer

P. multocida

question

Which species of legionella is positive for hippurate hydrolysis?

answer

L. pneumophilia

question

What is a characteristic of haemolphilus aegyptius?

answer

Requires X and V factors

question

Kingella dentrificans can be diffrentiated from N. gonorrhoeae because it is

answer

able to reduce nitrate

question

Which member of the family enterobacteriaceae is oxidase postive?

answer

plesiomonas

question

answer

P. aeruginosa

question

Foodborne outbreaks of brucellosis are most commonly associated with eating

answer

imported cheese

question

Serratia are unique in the family of enterobacteriaceae because of their ability to produce extracellular hydrolytic enzymes. Which is produced by serratia species?

answer

DNase

question

The optimal specimen for the recovery of Bordetella pertussis is

answer

nasopharyngeal swab

question

Blood cultures are recommended for the recovery of which of the following organisms?

answer

Brucella canis

question

CIN agar is recommended for the recovery of

answer

Yersinia enterocolitica

question

Why are cultures for Gardnerella vaginalis not recommended?

answer

isolation of the bacteria may not be clinically signficant

question

Buffered charcoal yeast extract agar is the recommended medium for the recovery of

answer

Legionella pneumophila

question

A number of vacationers who have traveled outside the US have had their vacations interrupted by a case of "travelers diarrhea," which is commonly associated with which etiologic agent?

answer

E. coli

question

Bacteria-producing clear colonies with black centers on Hektoen-enteric agar were isolated from a stool culture from a patient with diarrhea. What etiologic agent is it?

answer

salmonella

question

Which Neisseria spp. produces acid from glucose and maltose but not sucrose or lactose?

answer

N. meningitidis

question

The causative agent of the septicemic, hemolytic disease known as Oroya fever is

answer

B. bacilliformis

question

Lack of motility is a characteristic of

answer

klebsiella

question

Violet-colored colonies are typically produced by

answer

C. violaceum

question

Edwardsiella tarda is occasionally isolated in stool specimens and can be biochemically be confused with

answer

salmonella

question

The porphyrin test determines an organisms requirement for

answer

Hemin

question

What is an occasional cause of respiratory tract infections and is rapidly urea positive?

answer

B. bronchiseptica

question

The most common etiologic agent of community-acquired complicated cases of cystitis is

answer

E. coli

question

Association with faucet aerators and humidifiers used with ventilators in ICUs is commonly a factor in outbreaks of infections with which microorganism?

answer

P. aeruginosa

question

The selective nature of HE agar is due to the inclusion of what?

answer

bile salts

question

When performing the oxidase test, which would be appropriate?

answer

colonies from SBA can be used

question

The porphyrin test is most useful for the identification of which organism?

answer

Haemophilis

question

What is the best screening medium for identifying enterohemorrhagic E. coli?

answer

MacConkey agar with sorbitol

question

A young man developed keratitis associated with the use of contact lenses that had been immersed on a contaminated cleaning solution. The most common bacterial etiologic agent in such cases is

answer

P. aeruginosa

question

NYC agar was developed for the isolation of

answer

N. gonorrhoreae

question

Besides P. aeruginosa, what is an important cause of lower respiratory infections in patients with cystic fibrosis?

answer

Burkholdia cepacia

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