MICROBIOLOGY PROGRESS EXAM

100問 • 1年前

問題一覧

Flocked swab: * 1/1 Cotton Gauze Cotton and gauze Nylon

Nylon

The steam autoclave method of sterilization: * 1/1 Uses 15 lbs of pressure for 15 minutes Utilizes dry heat for 20 minutes Produces a maximum temperature of 100ºC Requires a source of ethylene oxide

Uses 15 lbs of pressure for 15 minutes

The most important diagnostic tool in treating patients with clinical infections in the emergency department: * 1/1 AFB stain Culture Gram stain IMVic reaction

Gram stain

Additional tests to be included with the IMViC reaction: * 0/1 Bacitracin and SXT susceptibility Catalase and coagulase Motility and H2S Oxidase and urease

Motility and H2S

Salmonella Shigella (SS) Agar is a modification of: * 0/1 BAP CAP DCA EMB

DCA

Cary-Blair indicator changes from red to yellow color: * 0/1 Buffering capacity was overcomed Change in the pH of the medium Low temperature Presence of contaminants

Buffering capacity was overcomed

When cultured in thioglycollate broth, these organisms grow slightly below the surface where oxygen concentrations are lower than atmospheric concentrations * 1/1 Aerotolerant anaerobes Facultative anaerobes Microaerophilic organisms Obligate aerobes

Microaerophilic organisms

Which one of the following specimen requests is acceptable? * 1/1 Feces submitted for anaerobic culture Foley catheter tip submitted for aerobic culture Rectal swab submitted for direct smear for gonococci Urine for culture of acid-fast bacilli

Urine for culture of acid-fast bacilli

Which of the following is the most appropriate method for collecting a urine specimen from a patient with an indwelling catheter? * 1/1 Remove the catheter, cut the tip, and submit it for culture Disconnect the catheter from the bag, and collect urine from the terminal end of the catheter Collect urine directly from the bag Aspirate urine aseptically from the catheter tubing

Aspirate urine aseptically from the catheter tubing

A liquid fecal specimen from a three-month-old infant is submitted for microbiological examination. In addition to culture on routine media for Salmonella and Shigella, this specimen should be routinely: * 0/1 Examined for the presence of Entamoeba hartmanni Examined for the presence of Camylobacter sp Screened for the detection of enterotoxigenic Escherichia coli Placed in thioglycollate broth to detect Clostridium botulinum

Examined for the presence of Camylobacter sp

Composition of 0.5 McFarland standard: * 1/1 1% sulfuric acid and 2.175% barium chloride 1% sulfuric acid and 1.175% barium chloride 1% hydrochloric acid and 2.175% barium chloride 1% hydrochloric acid and 1.175% barium chloride

1% sulfuric acid and 1.175% barium chloride

Standard agar depth of the Mueller-Hinton agar: * 1/1 1 to 2 mm 3 to 5 mm 6 to 8 mm 7 to 9 mm

3 to 5 mm

Susceptibility testing performed on quality control organisms using a new media lot number yielded zone sizes that were too large for all antibiotics tested. The testing was repeated using media from a previously used lot number, and all zone sizes were acceptable. Which of the following best explains the unacceptable zone sizes? * 1/1 The antibiotic disks were not stored with the proper desiccant The depth of the media was too thick The depth of the media was too thin The antibiotic disks were not properly applied to the media

The depth of the media was too thin

Quality control results for disk diffusion susceptibility tests yield the following results: aminoglycoside zones too small and penicillin zones too large. This is most likely due to the: * 1/1 Inoculum being too heavy Inoculum being too light pH of Mueller-Hinton agar being too low Calcium and magnesium concentration in the agar being too high

pH of Mueller-Hinton agar being too low

In disk diffusion susceptibility testing, as an antimicrobial agent diffuses away from the disk, the concentration of antibiotic is: * 1/1 Increased Decreased Unchanged Inoculum dependent

Decreased

After satisfactory performance of daily disk diffusion susceptibility quality control is documented, the frequency of quality control can be reduced to: * 1/1 Twice a week Every week Every other week Every month

Every week

An outbreak of Staphylococcus aureus has occurred in a hospital nursery. In order to establish the epidemiological source of the outbreak, the most commonly used typing method is: * 0/1 Pulsed-field gel electrophoresis Serological typing Coagulase testing Catalase testing

Pulsed-field gel electrophoresis

The organism most commonly associated with neonatal purulent meningitis is: * 0/1 N. meningitidis S. pneumoniae S. agalactiae S. pyogenes

S. agalactiae

One of the enterotoxins produced by enterotoxigenic Escherichia coli in traveler’s diarrhea is similar to a toxin produced by: * 1/1 Clostridium perfringens Clostridium difficile Vibrio cholerae Yersinia enterocolitica

Vibrio cholerae

Which of the following sets of tests best differentiates Salmonella and Citrobacter species? * 1/1 KCN, malonate, beta-galactosidase, lysine decarboxylase Dulcitol, citrate, indole, H2S production Lactose, adonitol, KCN, motility Lysine decarboxylase, lactose, sucrose, malonate, indole

KCN, malonate, beta-galactosidase, lysine decarboxylase

The Oriental rat flea, Xenopsylla cheopis, can be involved in transmitting which of the following microorganisms? * 1/1 Bartonella quintana Plasmodium spp. Rickettsia prowazeki Yersinia pestis

Yersinia pestis

Oxidase positive, urease negative: * 0/1 Bordetella bronchiseptica Bordetella pertussis Bordetella parapertussis All of these

Bordetella pertussis

A culture from an infected dog bite on a small boy’s finger yielded a small, gram-negative coccobacillus that was smooth, raised and beta-hemolytic on blood agar. The isolate grew on MacConkey agar, forming colorless colonies. The organism was motile, catalase positive, oxidase positive, reduced nitrate, and was urease positive within 4 hours. No carbohydrates were fermented. The most likely identification of this isolate is: * 0/1 Brucella canis Yersinia pestis Francisella tularensis Bordetella bronchiseptica

Bordetella bronchiseptica

While swimming in a lake near his home, a young boy cut his foot, and an infection developed. The culture grew a nonfastidious gram-negative, oxidase positive, beta hemolytic, motile bacilli that produced deoxyribonuclease. The most likely identification is: * 1/1 Enterobacter cloacae Serratia marcescens Aeromonas hydrophila Escherichia coli

Aeromonas hydrophila

A community hospital microbiology laboratory is processing significant numbers of stool cultures because of an outbreak of diarrhea following heavy rains and flooding in the country. A media that should be incorporated in the plating protocol is: * 1/1 Colistin nalidixic acid for Listeria MacConkey agar with sorbitol for Campylobacter Mannitol salt agar for Enterococcus species Thiosulfate citrate bile salts sucrose for Vibrio species

Thiosulfate citrate bile salts sucrose for Vibrio species

Stool specimens suspected of containing Vibrio spp. should be collected and transported only in: * 1/1 Amies medium Cary-Blair medium Stuart's medium Transgrow medium

Cary-Blair medium

Catalase positive, lactose negative, xylose positive: * 0/1 Haemophilus aegypticus Haemophilus ducreyi Haemophilus parainfluenzae Haemophilus influenzae

Haemophilus influenzae

The best procedure to differentiate Listeria monocytogenes from Corynebacterium species is: * 1/1 Catalase Motility at 25C Motility at 35C Gram stain

Motility at 25C

A patient has a suspected diagnosis of subacute bacterial endocarditis. His blood cultures grow non-spore-forming pleomorphic gram-positive bacilli only in the anaerobic bottle. What test(s) will give a presumptive identification of this microorganism? * 0/1 Beta-hemolysis and oxidase Catalase and spot indole Esculin hydrolysis Gelatin hydrolysis

Catalase and spot indole

Colonies appear shiny and mucoid because of the presence of a polysaccharide capsule: * 0/1 Candida albicans Cryptococcus neoformans Malassezia furfur Histoplasma capsulatum

Cryptococcus neoformans

LATEX AGGLUTINATION for cryptococcal _____ is now recommended test for Cryptococcus neoformans. * 0/1 Polysaccharide capsule Antigen Antibody Nucleic acids

Antigen

A mold grown at 25C exhibited delicate septate hyaline hyphae and many conidiophores extending at right angles from the hyphae. Oval, 2-5 um conidia were formed at the end of the conidiophores giving a flowerlike appearance. In some areas “sleeves” of spores could be found along the hyphae as well. A 37C culture of this organism produced small, cigar-shaped yeast cells. This organism is most likely: * 1/1 Histoplasma capsulatum Sporothrix schenckii Blastomyces dermatitidis Coccidioides immitis

Sporothrix schenckii

Virulence factors include aflatoxin, serine protease and aspartic acid proteinase: * 1/1 Aspergillus spp. Blastomyces dermatitidis Cryptococcus neoformans Histoplasma capsulatum

Aspergillus spp.

Most often, ______ are “dead-end” hosts. * 1/1 Amphibians Birds Humans Rodents

Humans

Delay in the processing of fluid specimens requires dilution in a viral transport medium before storage: * 0/1 1: 2 to 1:5 1:10 to 1:20 1:50 to 1:100 1:100 to 1:200

1: 2 to 1:5

The most sensitive method for the detection of β-lactamase in bacteria is by the use of: * 0/1 Chromogenic cephalosporin Penicillin Oxidase Chloramphenicol acetyltransferase

Chromogenic cephalosporin

According to the Kirby–Bauer standard antimicrobial susceptibility testing method, what should be done when interpreting the zone size of a motile, swarming organism such as Proteus species? * 1/1 The swarming area should be ignored The results of the disk diffusion method are invalid The swarming area should be measured as the growth boundary The isolate should be retested after diluting to a 0.05 McFarland standard

The swarming area should be ignored

Antimicrobial susceptibility testing of anaerobes is done by which of the following methods? * 1/1 Broth disk elution Disk agar diffusion Microtube broth dilution β-Lactamase testing

Microtube broth dilution

Cerebrospinal fluid (CSF) should be cultured immediately, but if delayed the specimen should be: * 1/1 Refrigerated at 4°C to 6°C Frozen at –20°C Stored at room temperature for no longer than 24 hours Incubated at 37°C and cultured as soon as possible

Incubated at 37°C and cultured as soon as possible

Select the method of choice for recovery of anaerobic bacteria from a deep abscess. * Cotton fiber swab of the abscess area Skin snip of the surface tissue Needle aspirate after surface decontamination Swab of the scalpel used for débridement

Needle aspirate after surface decontamination

Anaerobic bacteria are routinely isolated from all of the following types of infections except: * 0/1 Lung abscesses Brain abscesses Dental infections Urinary tract infections

Urinary tract infections

Prereduced and vitamin K1-supplemented blood agar plates are recommended isolation media for: * 1/1 Mycobacterium marinum and Mycobacterium avium intracellulare Bacteroides, Peptostreptococcus, and Clostridium spp. Proteus spp. Enterococcus spp.

Bacteroides, Peptostreptococcus, and Clostridium spp.

Which of the following is the medium of choice for the selective recovery of gram-negative anaerobes? * 0/1 Kanamycin–vancomycin (KV) agar Phenylethyl alcohol (PEA) agar Cycloserine–cefoxitin–fructose agar (CCFA) THIO broth

Kanamycin–vancomycin (KV) agar

Methods other than packaged microsystems used to identify anaerobes include: * 0/1 Antimicrobial susceptibility testing Gas–liquid chromatography (GLC) Special staining Enzyme immunoassay

Gas–liquid chromatography (GLC)

Semisolid transport media such as Amies, Stuart, or Cary–Blair are suitable for the transport of swabs for culture of most pathogens except: * 0/1 Neisseria gonorrhoeae Enterobacteriaceae Campylobacter fetus Streptococcus pneumoniae

Neisseria gonorrhoeae

Colistin–nalidixic acid agar (CNA) is used primarily for the recovery of: * 0/1 Neisseria species Enterobacteriaceae Pseudomonas aeruginosa Staphylococcus aureus

Staphylococcus aureus

Toxic shock syndrome is attributed to infection with: * 1/1 Staphylococcus epidermidis Staphylococcus hominis Staphylococcus aureus Staphylococcus saprophyticus

Staphylococcus aureus

Which Staphylococcus species, in addition to S. aureus, also produces coagulase? * 0/1 S. intermedius S. saprophyticus S. hominis All of these options

S. intermedius

An isolate of Staphylococcus aureus was cultured from an ulcer obtained from the leg of a diabetic79-year-old female patient. The organism showed resistance to methicillin. Additionally, this isolate should be tested for resistance or susceptibility to: * 1/1 Erythromycin Gentamicin Vancomycin Kanamycin

Vancomycin

Resistance to which drug categorizes a strain of Staphylococcus aureus as methicillin-resistant Staphylococcus aureus (MRSA)? * 0/1 Oxacillin Colistin Trimethoprim–sulfamethoxazole Tetracycline

Oxacillin

Which test is used for the determination of inducible clindamycin resistance in staphylococci and streptococci? * 1/1 E-test D-zone test A-test CAMP test

D-zone test

An outbreak of Staphylococcus aureus in the nursery department prompted the Infection Control Committee to proceed with an environmental screening procedure. The best screening media to use for this purpose would be: * 1/1 CNA agar THIO broth Mannitol salt agar PEA agar

Mannitol salt agar

Streptococcus species exhibit which of the following properties? * 1/1 Aerobic, oxidase positive, and catalase positive Facultative anaerobe, oxidase negative, catalase negative Facultative anaerobe, β-hemolytic, catalase positive May be α-, β-, or γ-hemolytic, catalase positive

Facultative anaerobe, oxidase negative, catalase negative

An isolate recovered from a vaginal culture obtained from a 25-year-old female patient who is 8 months pregnant is shown to be a gram-positive cocci, catalase negative, and β-hemolytic on blood agar. Which tests are needed for further identification? * 1/1 Optochin, bile solubility, PYR Bacitracin, CAMP, PYR Methicillin, PYR, trehalose Coagulase, glucose, PYR

Bacitracin, CAMP, PYR

The bile solubility test causes the lysis of: * 0/1 Streptococcus bovis colonies on a blood agar plate Streptococcus pneumoniae colonies on a blood agar plate Group A streptococci in broth culture Group B streptococci in broth culture

Streptococcus pneumoniae colonies on a blood agar plate

Nutritionally variant streptococci (NVS) require specific thiol compounds, cysteine, or the active form of vitamin B6. Which of the following tests supplies these requirements? * 0/1 CAMP test Bacitracin susceptibility test Bile solubility test Staphylococcal cross-streak test

Staphylococcal cross-streak test

All of the following are appropriate when attempting to isolate N. gonorrhoeae from a genital specimen except: * 1/1 Transport the genital swab in charcoal transport medium Plate the specimen on modified Thayer–Martin (MTM) medium Plate the specimen on New York City or Martin-Lewis agar Culture specimens in ambient oxygen at 37°C

Culture specimens in ambient oxygen at 37°C

A Gram stain of a urethral discharge from a man showing extracellular and intracellular gram-negative diplococci within segmented neutrophils is a presumptive identification for: * 1/1 Neisseria gonorrhoeae Neisseria meningitidis Moraxella (Branhamella) catarrhalis Neisseria lactamica

Neisseria gonorrhoeae

The β-galactosidase test aids in the identification of which Neisseria species? * 1/1 N. lactamica N. meningitidis N. gonorrhoeae N. flavescens

N. lactamica

Deoxycholate agar (DCA) is useful for the isolation of: * 0/1 Enterobacteriaceae Enterococcus spp. Staphylococcus spp. Neisseria spp.

Enterobacteriaceae

Xylose lysine deoxycholate (XLD) agar is a highly selective medium used for the recovery of which bacteria? * 0/1 Staphylococcus spp. from normal flora Yersinia spp. that do not grow on Hektoen agar Enterobacteriaceae from gastrointestinal specimens Streptococcus spp. from stool cultures

Enterobacteriaceae from gastrointestinal specimens

The Voges–Proskauer (VP) test detects which end product of glucose fermentation? * 0/1 Acetoin Nitrite Acetic acid Hydrogen sulfide

Acetoin

At which pH does the methyl red (MR) test become positive? * 0/1 7.0 6.5 6.0 4.5

4.5

The ortho-nitrophenyl-ß-galactopyranoside(ONPG) test is most useful when differentiating: * 1/1 Salmonella spp. from Pseudomonas spp. Shigella spp. from some strains of Escherichia coli Klebsiella spp. from Enterobacter spp. Proteus vulgaris from Salmonella spp.

Shigella spp. from some strains of Escherichia coli

In the test for urease production, ammonia reacts to form which product? * 0/1 Ammonium citrate Ammonium carbonate Ammonium oxalate Ammonium nitrate

Ammonium carbonate

Which of the following reagents is added to detect the production of indole? * 1/1 p-Dimethylaminobenzaldehyde Bromcresol purple Methyl red Cytochrome oxidase

p-Dimethylaminobenzaldehyde

Decarboxylation of the amino acids lysine, ornithine, and arginine results in the formation of: * 0/1 Ammonia Urea CO2 Amines

Amines

Putrescine is an alkaline amine product of which bacterial enzyme? * 1/1 Arginine decarboxylase Phenylalanine deaminase Ornithine decarboxylase Lysine decarboxylase

Ornithine decarboxylase

Which genera are positive for phenylalanine deaminase * 1/1 Enterobacter, Escherichia, and Salmonella Morganella, Providencia, and Proteus Klebsiella and Enterobacter Proteus, Escherichia, and Shigella

Morganella, Providencia, and Proteus

Biochemically, the Enterobacteriaceae are gram-negative rods that: * 1/1 Ferment glucose, reduce nitrate to nitrite, and are oxidase negative Ferment glucose, produce indophenol oxidase, and form gas Ferment lactose and reduce nitrite to nitrogen gas Ferment lactose and produce indophenol oxidase

Ferment glucose, reduce nitrate to nitrite, and are oxidase negative

Care must be taken when identifying biochemical isolates of Shigella because serological cross-reactions occur with: * 0/1 E. coli Salmonella spp. Pseudomonas spp. Proteus spp.

E. coli

Which of the following tests best differentiates Shigella species from E. coli? * 0/1 Hydrogen sulfide, VP, citrate, and urease Lactose, indole, ONPG, and motility Hydrogen sulfide, MR, citrate, and urease Gas, citrate, and VP

Lactose, indole, ONPG, and motility

Fever, abdominal cramping, watery stools, and fluid and electrolyte loss preceded by bloody stools 2–3 days before is characteristic of shigellosis but may also result from infection with: * 1/1 Campylobacter spp. Salmonella spp. Proteus spp. Yersinia spp.

Campylobacter spp.

A gram-negative rod is recovered from a catheterized urine sample from a nursing home patient. The lactose-negative isolate tested positive for indole, urease, ornithine decarboxylase, and phenylalanine deaminase and negative for H2S.The most probable identification is: * 0/1 Edwardsiella spp. Morganella spp. Ewingella spp. Shigella spp.

Morganella spp.

The Shiga-like toxin (verotoxin) is produced mainly by which Enterobacteriaceae? * 1/1 Klebsiella pneumoniae E. coli Salmonella typhimurium Enterobacter cloacae

E. coli

Following a 2-week camping trip to the Southwest (US), a 65-year-old male patient was hospitalized with a high fever and an inflammatory swelling of the axilla and groin lymph nodes. Several blood cultures were obtained, resulting in growth of gram-negative rods resembling “closed safety pins.” The organism grew on MacConkey’s agar showing non–lactose-fermenting colonies. Testing demonstrated a nonmotile rod that was biochemically inert. What is the most likely identification? * 1/1 Yersinia pestis Klebsiella pneumoniae Proteus vulgaris Morganella morganii

Yersinia pestis

The majority of clinical laboratories with a microbiology department should have the capability of serotyping which pathogenic Enterobacteriaceae? * 1/1 Yersinia enterocolitica, Shigella spp. E. coli O157:H7, Salmonella spp., Shigella spp. Yersinia pestis, Salmonella spp. Edwardsiella spp., Salmonella spp.

E. coli O157:H7, Salmonella spp., Shigella spp.

The drugs of choice for treatment of infections with Enterobacteriaceae are: * 1/1 Aminoglycosides, trimethoprim–sulfamethoxazole, third-generation cephalosporins Ampicillin and nalidixic acid Streptomycin and isoniazid Chloramphenicol, ampicillin, and colistin

Aminoglycosides, trimethoprim–sulfamethoxazole, third-generation cephalosporins

Which isolates of the Enterobacteriaceae family most commonly produce extended-spectrumβ-lactamase (ESBL)? * 0/1 E. coli and Klebsiella pneumoniae Yersinia enterocolitica and Yersinia pestis Morganella morganii and Proteus vulgaris Salmonella typhi and Shigella sonnei

E. coli and Klebsiella pneumoniae

Which test group best differentiates Acinetobacter baumannii from P. aeruginosa? * 0/1 Oxidase, motility, NO3 reduction MacConkey growth, 37°C growth, catalase Blood agar growth, oxidase, catalase Oxidase, TSI, MacConkey growth

Oxidase, motility, NO3 reduction

Which organism is associated with immunodeficiency syndromes and melioidosis (a glanders-like disease in Southeast Asia and northern Australia)? * 1/1 Pseudomonas aeruginosa Pseudomonas stutzeri Pseudomonas putida Burkholderia pseudomallei

Burkholderia pseudomallei

Which biochemical tests are needed to differentiate Burkholderia cepacia from S. maltophilia? * 0/1 Pigment on blood agar, oxidase, DNase Pigment on MacConkey agar, flagellar stain, motility Glucose, maltose, lysine decarboxylase TSI, motility, oxidase

Pigment on blood agar, oxidase, DNase

Alcaligenes faecalis (formerly A. odorans) is distinguished from Bordetella bronchiseptica with which test? * 1/1 Urease (rapid) Oxidase Growth on MacConkey agar Motility

Urease (rapid)

Cetrimide agar is used as a selective isolation agar for which organism? * 0/1 Acinetobacter spp. Pseudomonas aeruginosa Moraxella spp. Stenotrophomonas maltophilia

Pseudomonas aeruginosa

Which of the listed Pseudomonas spp. is associated with the following virulence factors: exotoxin A, endotoxins, proteolytic enzymes, antimicrobial resistance, and production of alginate? * 0/1 P. fluorescens P. putida P. stutzeri P. aeruginosa

P. aeruginosa

Select the media of choice for recovery of Vibrio cholerae from a stool specimen. * 1/1 MacConkey agar and thioglycollate media Thiosulfate–citrate–bile–sucrose (TCBS) agar and alkaline peptone water (APW) broth Blood agar and selenite-F (SEL) broth CNA agar

Thiosulfate–citrate–bile–sucrose (TCBS) agar and alkaline peptone water (APW) broth

Abdominal pain, fever, vomiting, and nausea prompted an elderly male to seek medical attention. A watery stool specimen producing no fecal leukocytes or erythrocytes was cultured and grew a predominance of gram-negative fermentative bacilli. The colonies were beta-hemolytic on blood agar and cream colored on MacConkey agar. The colonies were both oxidase and catalase positive. What is the most likely identification? * 0/1 Aeromonas hydrophilia Escherichia coli Salmonella spp. Shigella spp.

Aeromonas hydrophilia

Several attendees of a medical conference in the Gulf coast area became ill after frequenting a seafood restaurant. A presumptive identification of Vibrio cholera was made after stool specimens from several subjects grew clear colonies on MacConkey agar and yellow colonies on TCBS agar. Which key tests would help eliminate Aeromonas and Plesiomonas spp.? * 0/1 Mannitol fermentation, Na+ requirement Oxidase, motility Oxidase, nitrate Hemolysis on blood agar, catalase

Mannitol fermentation, Na+ requirement

Which of the following tests should be done first in order to differentiate Aeromonas spp. from the Enterobacteriaceae? * 1/1 Urease OF glucose Oxidase Catalase

Oxidase

Which atmospheric condition is needed to recover Campylobacter spp. from specimens inoculated onto a Campy-selective agar at 35°C–37°C and 42°C? * 1/1 5% O2, 10% CO2, and 85% N2 20% O2, 10% CO2, and 70% N2 20% O2, 20% CO2, and 60% N2 20% O2, 5% CO2, and 75% N2

5% O2, 10% CO2, and 85% N2

Which group of tests best differentiates Helicobacter pylori from C. jejuni? * 1/1 Catalase, oxidase, and Gram stain Catalase, oxidase, and nalidixic acid sensitivity Catalase, oxidase, and cephalothin sensitivity Urease, nitrate, and hippurate hydrolysis

Urease, nitrate, and hippurate hydrolysis

Smooth gray colonies showing no hemolysis are recovered from an infected cat scratch on blood and chocolate agar but fail to grow on MacConkey agar. The organisms are gram-negative pleomorphic rods that are both catalase and oxidase positive and strongly indole positive. The most likely organism is: * Capnocytophaga spp. Pasteurella spp. Proteus spp. Pseudomonas spp

Pasteurella spp.

A 29-year-old male who often hunted rabbits and spent a lot of time in the woods was admitted to the hospital with skin ulcers on his upper extremities. At 48 hours, a small coccobacillus was recovered from the aerobic blood culture bottle only. The organism stained poorly with Gram stain, but did stain with acridine orange. Cultures taken from the ulcers did not grow on primary media. What is the most likely identification? * 1/1 Pseudomonas aeruginosa Pseudomonas fluorescens Chryseobacterium spp. Francisella tularensis

Francisella tularensis

An elderly woman who cared for several domestic cats was hospitalized with suspected cat-scratch disease (CSD). Blood cultures appeared negative, but a small, slightly curved pleomorphic gram-negative bacillus grew on BHI agar (brain, heart infusion agar with 5% horse or rabbit blood). What is the most likely identification? * 0/1 Bartonella spp. Brucella spp. Kingella spp. Haemophilus spp

Bartonella spp.

A neonate was readmitted to the hospital with a diagnosis of meningitis. The CSF revealed gram-negative straight rods. At 24 hours, the organism grew on 5% sheep blood and chocolate agars displaying a yellow pigment. On MacConkey agar, it appeared as a non–lactose fermenter. Colonies were oxidase, DNase, and gelatinase positive, and oxidized glucose and mannitol. What is the most likely identification? * 1/1 Haemophilus influenza Chryseobacterium meningosepticum Stenotrophomonas maltophilia Acinetobacter baumannii

Chryseobacterium meningosepticum

A 46-year-old dog warden was admitted to the hospital with several puncture bite wounds encountered while wrangling with a stray dog. Culture at 48 hours produced small yellow colonies on 5% sheep blood and chocolate agars in10% CO2, but no growth on MacConkey agar. Gram stain showed gram-negative curved, fusiform rods. Colonies were oxidase and catalase positive. What is the most likely identification? * 1/1 Capnocytophaga canimorsus Francisella tularensis Legionella pneumophila Pseudomonas aeruginosa

Capnocytophaga canimorsus

A suspected case of Legionnaires’ disease was noted on the request form for a culture and sensitivity ordered on a sputum sample. The patient was a 70-year-old male who presented with a positive serological test for Legionella spp. What is the most efficient way to confirm the infection using the submitted sample? * 1/1 Culture the sputum on MacConkey agar Gram stain of the sputum Acid-fast staining Direct immunofluorescent microscopy

Direct immunofluorescent microscopy

Which of the following organisms will display lipase activity on egg yolk agar? * 0/1 Clostridium botulinum Clostridium sporogenes Clostridium novyi (A) All of these options

All of these options

Identification of Clostridium tetani is based upon: * 0/1 Gram stain of the wound site Anaerobic culture of the wound site Blood culture results Clinical findings

Clinical findings

100

Cycloserine–cefoxitin-fructose agar (CCFA) is used for the recovery of: * 1/1 Yersinia enterocolitica Yersinia intermedia Clostridium perfringens Clostridium difficile

Clostridium difficile

other names parasitology

Yves Laure Pimentel · 70問 · 2年前

other names parasitology