del 4 Flashcards
Gram negative – motile rods include genera:
a. Proteus, Pseudomonas, Escherichia.
b. Pseudomonas, Salmonella, Yersinia
c. Fransicella, Proteus, Pasteurella.
d. Vibrio, salmonella, Proteus.
T: a, b, d
F: c
Special growth conditions requires bacteria:
a. Staphylococcus, Mycobacterium, Actinobacter .
b. Acticobacillus, haemophilus, mycobacterium.
c. Actinobacter, actinobacillus, bacillus.
d. Heamophilus, brucella, staphylococcus.
T: b, d
F: a, c
Actinobacillus, haemophilius, mycobacterium, brucella and staphylococcus.
Family Enterobacteriaceae
a. Are Gram-negative rods, mostly motile – except of the genera Shigella and Klebsiella
b. E. coli as intestinal pathogens are classified in phylogenic group D
c. Within Salmonella, we distinguish 6 main O-antigen groups and more than 2600 serotypes
d. Representatives of the genera Klebsiella and Proteus are often the cause of nosocomial infections, as some strains are characterised by multidrug resistance to ATBs
T: a, b
F: c, d
Pathogenic E.coli:
a. May produce enterotoxins, verotoxins and cytotoxic necrotizing factor.
b. Produce colicins, toxins of coliform bacteria, which act against other pathogenic E-coli strains.
c. The main virulence factors are fimbrial antigens which consist of LPS.
d. Verotoxin VT1 and VT2 inhibit proteosynthesis and are responsible for endothelium damage.
T: a, b, d
F: c
Genus salmonella:
a. Bacteria from this genus do not ferment lactose, genus includes only two species but over 2000 serotypes.
b. The two main toxins of salmonella are enterotoxins and cytotoxins.
c. S.enteritidis is a significant pathogen which causes zoonosis.
d. Host adapted salmonella serotypes include S.pullorum, S.paratyphi, S.dublin.
T: a, b, c, d
Virulence factors of salmonella spp are:
a. Lipid A of cell wall.
b. Alpha and beta heamolysins.
c. Exotoxins: enterotoxin and cytotoxin.
d. Capsule which allows for intracellular surviving.
T: c
F: a, b, d
Host non adaped salmonella serovars are:
a. Salmonella typhimurium, salmonella paratyphi.
b. S. dublin, S.gallinarum.
c. S. typhi, S.paratyphi.
d. S.enteritidis, S. Typhimurium.
T: d
F: a, b, c
Yersinias
a. Important factors in the pathogenicity of yersinias include a large capsule and the ability to form endospores
b. Y. pseudotuberculosis causes mesenterial lymphadenitis in animals and humans
c. Are able to survive and multiply within the macrophages as well as salmonella
d. Y. enterocolitica is an invasive pathogen that penetrates the enteric mucous membrane through M cells of Peyer’s patches
T: b, c, d
F: a
Yersinias neither form capsules nor endospores
Brucellas
a. They only have three surface polysaccharide antigens marked as A, M and R
b. They are invasive and produce cytotoxins which damage cells of reproductive organs
c. They are aerobic to microaerophilic bacteria causing granulomatous inflammation in various organs
d. They are facultative intracellular parasites which are able to survive in the monocytes and macrophages, penetrate through intact mucous membranes
T: a, c, d
F: b
Pseudomonas aeruginosa
a. Produce pyocyanin pigment that damages microvilli of enterocytes
b. Causes pyogenic infections, mastitis, pneumonia and lung abscesses in animals
c. Grows at refrigerator temperature (4°C) and is carried by food.
d. Is a Gram-negative, rod-shaped, catalase and oxidase positive, motile, and strictly aerobic bacteria
T: b, d
F: a, c
Insects play an important role in the transmission of these pathogens:
a. Francisella tularensis, mycobacterium bovis, campylobacter jejuni.
b. Borrelia burgdoferi, yersinia pestis, francisella tularensis.
c. Mycoplasma pneumoniae, brucella ovis, coxiella burnetti.
d. Coxiella burnetti, yersinia pestis, rickettsia rickettsii.
T: b, d
F: a, c
