Salmonella & Shigella Flashcards Preview

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Flashcards in Salmonella & Shigella Deck (23):
0

Differentiate food infection from food intoxication.

Food infection - results from intake of live pathogens that continue to grow inside body
Food intoxication - is caused by intake of toxins formed by microorganism as they grow in the food prior to consumption

1

(1) Gram negative bacilli
(2) Most are non-motile
(3) Non-lactose fermenter
(4) Most produce H2S (slight production only)

Which is false about Salmonella?

(2) Most are non-motile

Motile dapat.

2

A.Form acid in glucose but not in mannose
B.Usually survive freezing in water
C.Resistant to: Brilliant green, Sodium tetrathionate, Sodium deoxycholate

Which is false about Salmonella?

A.Form acid in glucose but not in mannose

Both glucose and mannose dapat

3

In __ agar, Salmonella species grows green to blue green colonies with black centers.

Hektoen

4

Basis of classification for Shigella species

"O" antigen and biochemical reactions

5

Salmonella enteriditis can also infect animals. True or false?

True. In fact, animals ang primary host.

6

Salmonella can only enter the body orally. True or false?

True

7

Salmonella is only involved in food infection. True or false?

False. In typhoid fever, it can also induce gastroenteritis via its toxins. : Presence of toxins--> Secretion of water and electrolytes from cell --> diarrhea

8

False about Salmonella cholerasius
(A)Oral infection, early invasion of bloodstream
(B)Focal lesions: lungs, bones, meninges
(C)with intestinal manifestations
(D) positiveblood cultures

C

9

One of the symptoms of Enterocolitis is constipation. True or false?

False. Diarrhea dapat.

10

(1) Blood - taken only once
(2) Bone marrow cultures
(3) Urine cultures - maybe (+) after second week
(4) Stool - taken repeatedly
(5) Duodenal drainage - (+), carriers

Which is false about the specimen obtained for Salmonella?

(1) bec blood must be taken repeatedly

11

Selenite F, terathionate broth are media used for isolating Shigella. True or false?

False. Salmonella yan.

12

In all Salmonella cases, the body only produces IgG for antibody defense. True or false?

False. IgM also. Kaya detected din ng Widal test and Typhidot. For Typhidot:
• IgM(+) only or IgM and IgG(+): acute typhoid due to S. typhi
• IgG(+) only: possibly persistent typhoid/ relapse/ re-infection/ convalescent / carrier/ past typhoid

13

Primary bacterial cause of salmonellosis

Salmonella enteritidis

14

Diarrhea in salmonellosis is caused by enterotoxin. T or F?

F. Exotoxin dapat

15

In salmonellosis, drugs for gut motility may be freely used. True or false?

False. Contraindicated sila

16

Shigella dysenteriae has produces potent enterotoxins that lead to cell death and necrosis of colonic epithelia. True or false?

False. Exotoxin dapat.

17

Shiga toxin is ___
A. Cytotoxic
B. Enterotoxic
C. Both

A

18

False about Shigella
A.Non-lactose fermenting, non-motile,
B.able to produce gas in glucose C.humans – only natural host
D.Acid-resistant – survive passage through stomach

B

19

Flies can be vectors of Shigella, true or false?

True

20

Severe shigellosis may develop into __

pseudomembranous colitis

21

Two Best specimens to collect in diagnosing Shigella

Feces
Rectal swab

22

Both mild and severe Shigellosis involve invasion of submucosa. T or F?

F. Severe lang