del 3

Question 1

Listeria
a. Intracellular survive in phagocytes is the main pathogenic feature of these bac.
b. Haemolysin-listeriolysin A is a very imp virulence factor in listera.
c. Are able to penetrate into cells by polymerization of the host cell and by formation of long actin fibres.
c. With increasing temperature the active motility of listeria also increases.

Answer 1

T: a, c
F: b, d

Question 2

Mycobacteriae:
a. Scotochromogenic mycobacteria produce pigments in the presence of light and also without light.
b. Scotochromogenic mycobacteria produce pigments independently of the presence of light.
c. Mycobacterium avium complex includes mycobacteriae which cause disseminated infections such as psittacosis and ornitosis.
d. Cord factor and intracellular survive include to virulence factors of M.tuberculosis
e. Colonies of slow growing mycobacteriae are visible on 4-5days after innocubation
f. M. avium subsp. paratuberculosis is an important species, which cause a serious infection of the respiratory tract
g. Cause of acute respiratory infections in humans and animals resulting in granulomatous inflammation
h. Main factor of virulence is the ability of intracellular survival in alveolar macrophage

Answer 2

T: d, g, h
F: a, b, c, e, f

Scotochromogenic mycobacteria produce pigments in dark only.
psittacosis and ornitosis - chlamydia
slow growing - more than 7 days

Question 3

Clostridia produce toxins:
a. Extracellular and sporulating.
b. Dermonecrotoxic and intracellular.
c. Protoplasmic and extracellular.
d. Lethal and extracellular.

Answer 3

T: a, c
F: b, d

Question 4

Which of these postulates are true:
a. Mycoplasma pneumoniae is a causative agent of tuberculosis.
b. Nocardia asteroides is a causative agent of botryomycosis.
c. Chlamydophilia psitaci is a causative agent of Q-fever.
c. Pseudomonas aeruginosa and B.bronchiseptica are causative agents of atrophic rhinitis.

Answer 4

F: a, b, c, d

Question 5

Bacilus antracis
a. Exotoxin complex consists of 3 factors: edematogenic, protoplasmic and lysogenic
b. Production of the endospore and polysaccharide capsule are the main virulence factor.
c. Carnivores and poultry are naturally resistant to infection
d. It resists phagocytosis, is able to survive intrcellularly, spread through the bloodstream, leads to septicaemia

Answer 5

T: c, d
F: a, b

Question 6

Bacillus antracis, Klebsiella pneumoniae, streptococcus pneumoniae are:
(KLEB=O+K, BAC=O+K)
a. Important species of encapsulated pathogenic bacteria.
b. Bacteria producing many various types of enterotoxins.
c. Are very close species acc to its antigenic formula.
d. Are non-motile bacteria.

Answer 6

T: a, d
F: b, c

Question 7

Faculative intracellular bacteria are:
a. Salmonella, listeria, and E.coli.
b. Bordetella, salmonella and brucella.
c. Brucella, francisella and salmonella.
d. Staphylococcus, streptococcus and listeria.

Answer 7

T: a, c
F: b, d

Question 8

Mycoplasmas
a. Mycoplasma infections are latent and usually have a chronic cause
b. They are characterised by a relatively strict host specificity, M. synoviae is the causative agent of poultry bursitis
c. The cell wall of mycoplasmas is rich in lipids, has a hydrophobic nature, and is resistant to penicillin.
d. The Mycoplasmataceae family also includes ureaplasmas, which can also cause respiratory infections.

Answer 8

T: a, d
F: b, c

poultry bursitis caused by brucella abortus
they dont have cell mambrane

Question 9

Coagulase positive staphylococci:
a. S. aureus can cause pyogenic localised infections (abscesses) or even generalized infection
b. Protein A of pathogenic staphylococci allows their intracellular survival in phagocytes
c. They have pathogenic potential, convert soluble fibrinogen into fibrin, which has an anti-phagocytic effect
d. S. aureus can cause food poisoning because some strains produce enterotoxins

Answer 9

T: a, c, d
F: b

Question 10

Streptococci
a. Late consequences of S. pyogenes infection include acute glomerulonephritis or rheumatic fever
b. Are divided into serotypes A-V according to antigenic characteristics of their capsular antigens.
c. The virulence factor of S. pneumoniae is the M protein (pneumolysin), which is located in the cell wall.
d. S. agalactiae belongs to group B streptococci and is the cause of chronic mastitis of cow and sheep

Answer 10

T: d
F: a, b, c

Question 11

Virulence factors of Streptpcoccus pyogenes include:
a. Protein M, which has antiphagocytic and adherence effect.
b. Protein A with cytotoxic effect.
c. Haemolysins, which cause damage of leucocytes.
d. Capsules from hyaluronic acid with antiphagocytic effect.

Answer 11

T: a, c, d
F: b