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Flashcards in microbiology Deck (59)
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1

campylobacter jejuni

food borne cause of fever, abdominal pain and diarrhea; both kids and adults

2

rotavirus

most common cause of viral gastroenteritis in infants/children; can lose fluids and become dehydrated

3

escherichia coli

hemolytic-uremic syndrome in kids

4

cryptosporidiosis

watery diarrhea in immunocompromised adults by cryptosporidium

5

listeriosis

congenital infection that is present with meningitis and sepsis at birth -- food or water borne

6

norwalk virus

common cause of diarrhea in adults

7

shigellosis

dysentery with bloody diarrhea

8

cholera

massive fluid loss

9

what is the agent that is associated with duodenal peptic ulcers?

H pylori

10

vibrio parahaemolyticus

found in raw shellfish

11

yersinia enterocolitica

invasive; extraintestinal infection

12

staph aureus causes food poisoning through...

food poisoning through elaboration of an enterotoxin that causes explosive diarrhea within 2 hrs of ingestion

13

entamoeba histolytica

colonic mucosal invasion with exudate and ulceration; stool with blood and mucus
self limited diarrhea with following liver abscess(via submucosal invasion --> veins --> portal system --> liver)

14

Special defenses of saliva

and organisms with a resultant tactic?


secretory IgA in saliva that selectively inhibits adherence of bacteria

Neisseria gonorrhœae (which causes gonorrhea), Strep pneumoniae, and Haemophilus influenzae type B all releases a protease that destroys IgA.

15

small intestine defenses

peristalsis
flow of liquids
shedding of epithelium
peyers patches
igA
mucous

16

peyers patches

cells that are only in the ileum
-- they sample antigen, initiate immune response in the mucosa, and activate T and B cells

17

body flora increase in numbers with...

distance from stomach
(few in esophagus or stomach)

18

common oral flora

Many anaerobes:
a-streptococci,
Neisseria spp.,
diptheroids (nonpathogenic corynebacteria),
lactobacilli,
spirochetes (treponema denticola),
mycoplasma

19

B-hemolytic strep groups vs a-hemolytic strep groups

B - complete hemolysis
---pyogenes or agalactiae
a - partial hemolysis
---pneumoniae or viridans

20

a-streptococci types that is abundant in flora of mouth? throat?

viridans is more common in mouth
pneumoniae is more common in the pharynx/throat

21

viridans streptococci

streptococci with no defined Lancefield group antigens (Lancefield classification is based on carbohydrate antigens on the bacterial surface); normal flora of the respiratory tract but can cause dental caries, bacterial endocarditis, and other disorders in immunocompromised hosts.

22

6 types of strep viridans
(c,mm,sss)

• S. mutans = dental caries
• S. mitis = cheek region
• S. sanguinis, no preference of locations
• S. salivarius = dorsal side of the tongue
• S. salivarius ssp. thermophilus
• S. constellatus, occasional human pathogen,

23

the strep of dental caries

strep mutans

24

strep of cheek region?

strep mitis

25

strep of dorsal side of tongue?

strep salivarius

26

lactobacilli

Gram-positive facultative anaerobic or microaerophilic rod-shaped bacteria. They are part of the lactic acid bacterial group, whose members convert lactose and sugars to lactic acid. In humans they are present in the vagina and the GI tract. They are typically benign, except in the mouth where they are associated with cavities/dental caries.

27

Periodontitis

requires bacteria to occur but that alone is not sufficient --> genetics and environment also play a role

28

periodontitis due to diabetes mellitus --

porphyromonas gingivalis

29

periodontitis with cardiovascular disease --

Porphyromonas gingivalis
Tannerella forsythia
T. denticola

30

pariodontitis with adverse pregnancy

porphyromonas gingivalis