Normal Flora or Pathogen?/Antimicrobials Flashcards Preview

Micro Exam #2 > Normal Flora or Pathogen?/Antimicrobials > Flashcards

Flashcards in Normal Flora or Pathogen?/Antimicrobials Deck (65)
Loading flashcards...
1

What three interactions can define the relationships of humans and their bacteria?

Commensalism, Mutualism, Parasitism

2

What is commensalism?

One benefits, other gets neither benefit nor harm

3

How might we benefit from commensal bacteria?

They compete with harmful bacteria

4

Important examples of mutualism in gut bacteria

Regulation of pro-antiinflammatory T-cell switch
Loss of certain bac associated with Crohn's
Interactions with hormones

5

Alteration in microbiota of URT associated with...

Asthma

6

Significance of resident flora?

Very unique for each individual body part

7

Name for organisms that are not normally pathogenic, but can cause disease under special circumstances?

Opporutnistic/Pathobiont

8

Three special circumstances that pathobionts may play into?

Immunocompromised individuals
Accidental entry
Inflammation

9

Why is skin hard to colonize?

low pH
high NaCl
Lysozyme

10

Three primary bacterial organisms associated with the skin.

Staph Epidermis
Aerobic Corynebacterium
Propionibacterium acnes (in oily spots)

11

What part of the skin colonizes G-

Oily parts

12

What part of the epidermis has a substantially different microbial community from the others? Why?

Labia minora
Acidic conditions let lactobacilis take over

13

Three primary bacterium of the nasopharynx?

Proprionibacterium
Staph epidermis (and sometimes aureus)
Diptheroids (chinese characters)

14

Four opportunistic bacteria associated with nasopharynx?

Viridans streptococci
Streptococcus pneumoniae
Nisseria meningitidis
Hemophilus influenzae

15

Bacteria at the base of dental plaques

streptococcus

16

Four most important resident bacteria of the mouth and oropharynx?

alpha-hemolytic Strep (including mutans)
Staph epidermis (and aureus)
Pasteurellaceae
Actinomyces israelii

17

Most important bacteria of the stomach?

helicobacter pylori

18

Most important bacteria of the duodenum?

Lactobacillis

19

Most important bacteria of jejuno-ileum?

Enterobacteriaceae
G- Anerobes (Bacteroides)

20

Most important bacteria of the colon?

Bacteroides

21

Three gut enterotypes important for establishment of digestive health?

Bacteroides
Prevotella
Ruminococcus

22

What bacteria is more prevalent in high fat diets? high fiber diets?

fat -- Bacteroides
Fiber -- Prevotella

23

Relationship of bacteria to gut flora

They don't directly contact eachother, or inflammation will occur.

24

Most common bacteria of the vagina

Lactobacillis
Bacteriodes
Prevotella

25

Changes in vaginal pH over the life cycle?

Acidic at birth
neutral till puberty, then acidic again

26

Most common bacteria of conjunctiva?

Staph/Strep
Hemophilus
diptheroids

27

List Six Sterile Areas

Lungs beyond trachea
Internal organs (minus digestive tract)
Fluids (Blood, Lymph, Semen)
CNS
Ear beyond Eardrum
Fetus

28

Difference between viral and bacterial latency

In bacterial latency, organism is still present, but in lower numbers

29

Three types of adhesion factors involved in virulence factors.

Pili/Fimbriae
Adhesins
Capsules

30

Intracellular invasion/colonization factors

Streptokinase - dissolves blood clots
Hyaluronidase - Hydrolyzes connective tissues
Neurominidase - Degrades sialic acid glue
Collagenase - Destroys tissue