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Bacteria > Ch (8) > Flashcards

Ch (8) Flashcards

1
Q

Mention the species of salmonella that ferment sugar into acid only and the species that ferment sugar into acid and gas

A

acid only in case of S. Typhi,
acid and gas in case of S. Paratyphi.

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2
Q

Which of the following types of suger that salmonella can’t ferment
Glucose and maltose
Glucose and mannite
Glucose and lactose
Lactose and sucrose
Lactose and maltose

A

Lactose and sucrose

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3
Q

Which of the following bacteria has the Vi antigen
Salmonella Typhi
Salmonella Paratyphi
E.coli
Proteus

A

Salmonella Typhi

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4
Q

The Salmonella invade into and multiply in which of the following

the G cells of the stomach .

the M cells of the stomach .

the G cells of the small intestine.

the M cells of the small intestine.

A

the M cells of the small intestine.

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5
Q

Case study.
Patient complain from nausea, headache, vomiting, nonbloody profuse diarrhea, with few leukocytes in the stools. Caused by Salmonella after clinical recovery, what did you expect the Stool culture result?

A

positive for several weeks

positive for several days

positive for several hours

Negative

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6
Q

Mention the 3 types of Salmonella that cause Bacteremia

A

S. Choleraesuis, S Typhi and S. Paratyphi.

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7
Q

Mention the 4 types of Salmonella that cause Enteric fever (typhoid fever)

A

S. Typhi, S. Paratyphi A, S. Schttmuelleri, and S. Hirschfeldii.

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8
Q

What is the incubation time of Enteric fever (typhoid fever)

A

10-14 days.

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9
Q

What is the incubation time of Enteritis

A

6-48 hours.

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10
Q

What is the best treatment for Enteric fever and bacteremia

A

require antibiotic treatment:
chloramphenicol, ampicillin, trimethoprim-
sulfamethoxazole. Surgical drainage of metastatic
abscesses may be required.

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11
Q

What is the best treatment for Salmonella enterocolitis

A

needs only supportive therapy
(antibiotic treatment may prolong the symptoms and
excretion of the salmonellae). Drugs to control
hypermotility of the gut should be avoided.

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12
Q

What is the best treatment for Chronic carriers of S. Typhi

A

may be cured by antibiotics alone or combined with cholecystectomy.

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13
Q

In Enteric fever (typhoid fever) the results of the following cultures will be positive after how many times
Blood culture
Stool culture
Urine culture

A

Blood cultures are positive during the first week and after the second week

Stool cultures and sometimes urine cultures are positive after the second week

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14
Q

What is the Widal test?

A

It is indirect serological test for antibodies against Salmonella typhi.

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15
Q

In Enteric fever (typhoid fever) mention the types of agar for the following cultures
Blood culture
Stool culture
Urine culture

A

Blood culture on MacConkey or DCA medium.

Stool culture on MacConkey or DCA medium or salmonella-shigella (SS) agar and also inoculated into tubes of selenite and tetrathionate broth

Urine culture on MacConkey or DCA medium.

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16
Q

Mention the 2 types of Salmonella that cause food poisoning:

A

S. Typhimurium and S. Enteritidis

17
Q

For each of the following Shigella species mention the type of suger they ferment and the product
Sh. dysenteriae.
Sh. flexneri
Sh. boydii
Sh. sonnei.

A

Sh. dysenteriae. Ferment Glucose only
Sh. flexneri. Ferment Glucose and Mannite
Sh. boydii. Ferment Glucose and Mannite
Sh. sonnei. Ferment Glucose and Mannite and late fermenter of Lactose
All of them produce acid only

18
Q

What is the Incubation period for Bacillary dysentery (Shigellosis):

A

1-3 days

19
Q

From the following what is the type that causes most severe form of Bacillary dysentery (Shigellosis):

Sh. dysenteriae.
Sh. flexneri.
Sh. boydii.
Sh. sonnei.

A

Sh. dysenteriae

20
Q

samples of shigella are inoculated on

A

MacConkey and DCA and on selenite broth.

21
Q

In case of Shigellosis which of the following drugs should be avoided

chloramphenicol
ampicillin
tetracycline
Opiates

A

Opiates

22
Q

The most cases of Shigellosis occur in

A

children under 10 years of age.

23
Q

Which of the following yersinia can cause Black Death
Yersinia pestis
Yersinia pseudotuberculosis
Yersinia enterocolitica

A

Yersinia pestis

24
Q

Which of the following yersinia can grow in refrigerated food.
Yersinia pestis
Yersinia pseudotuberculosis
Yersinia enterocolitica

A

Yersinia enterocolitica

25
Q

When Yersinia pathogen secretes its proteins into the phagocyte result in which of the following

Necrosis of macrophage
apoptosis of macrophage
necrosis of lysosome
apoptosis of lysosome

A

apoptosis of macrophage

26
Q

How the Yersinia pestis transmitted to man?

A

by the rat- flea Xenopsylla cheopis.

27
Q

Mention the Incubation period and mortality rate for both
Bubonic plague
Pneumonic plague

A

Bubonic plague: Incubation time: 2-7 days. Mortality: 75% if untreated.
Pneumonic plague: Incubation time: 2-3 days. Mortality: 90% if untreated.

28
Q

Which of the following can cause pseudoappendicitis (enlarged mesenteric lymph nodes) in children?

Y. enterocolitica
Y. pseudotuberculosis
Y. pestis

A

Y. enterocolitica

29
Q

We use method called (cold enrichment) for……..

A

Y. enterocolitica

30
Q

Mention the three genera of bacteria that are considered members of the tribe Proteusae are?

A

Morganella
Proteus
Providencia

31
Q

Mention the member of the tribe Proteusae that can cause traveller’s diarrhea

A

Providencia

Bacteria (5 decks)

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