M4 Sources of Microorganisms Flashcards Preview

Microbiology 2 > M4 Sources of Microorganisms > Flashcards

Flashcards in M4 Sources of Microorganisms Deck (44):
1

what s the sequence of events for pathogenesis

adhere/colonise and invade
evade host defence
multiply/compete its life cycle
exit host

2

what are some common bacteria use humans as reservoir

TB
Diphtheria
Hep A & B
Influenza
Measles

3

what are some common bacteria use animals as reservoir

Zoonoses
accidental infection of man
may involve vector
plague

4

what are some sources of environment for bacteria

soil nd water
contaminated sewage
opportunistic pathogens

5

what are some bacteria that use the environment as a resveoir

clostridium tetani
legionella

6

what is an animate nd inanimate source

animate - animal
inanimate - environment

7

what is human period of infectivity

casual hours
acute days
transient weeks
chronic months +

8

what are the carrier states

active
convalescent
healthy
incubator

9

what is the active state

overt clinical presentation

10

what is the convalescent state

recovering bit still carrier

11

what is a healthy state

no overt signs of illness

12

what is the incubator state

maintaining large numbers of pathogens prior to illness

13

what are the means exiting a host

natural or artificial

14

what is the natural exit way

sneezing, shedding

15

what sit he artificial exit way

blood, saliva, aerosols (drill)

16

what are some means of spreading to new host

direct/indircet contact
air bourne
vector bourne

17

what are the types of direct contact spread

vertical - child to mum
horizontal - cough

18

what are the types of indirect contact speed

format

19

what is an air bourne spread

droplets
aerosols

20

what is vector bourne spread

insects

21

how can microbes escape body

tears
nasal sec
saliva
blood
resp fluid
contact with skin
breast milk
faeces
semen
urine

22

what are some routes of microbial entry

ingestion
inhalation
injection
across mucous mem
into ear
transplacental

23

what kind of bac can be ingested

salmonella

24

what kind of bac can be inhaled

myco TB

25

what kind of bac can be injected

Hep b

26

can reservoirs change

can vary during the course of a disease

27

what is an exogenous bac

infective material derived from outside patients body

28

what is endogenous

bac/fungi part of natural microbiota commensal
change in natural flora

29

what are some infections from exogenous bac

TB - myco - humans
Pneumonia - legionella - soil/water
Tetanus - clostridium tetani - soil

30

what bac present when burns or wounds

s aureus
p aeruginosa

31

what bac present when bowel rupture

bacteriodes fraigils

32

when is there a normal presence of foreign body

prosthesis
catheters
absence of shedding surface an form of biofilms

33

what are some key points on biofilms

multi cellular community
3D
interfaces
water channels
resistant to antimicrobial agents and host defences

34

what si the way a bacteria can go to the incorrect site

heatogenuos spread

35

what can suppress immune system

cancer therapy
immune suppression
reduced Abs

36

what are some exogenous infections pathogens

influenza - destroy line of resp tract
AIDS immune suppression

37

antibiotics can disrupt what microflora

natural flora
c albicans
c difficile

38

what are the factors in establishing disease

dose of infectious agent
virulence of organisms
seusceptitbitly/ resistance of host

39

give a summary of pathogenesis

source microbe
escape form source
spread to new host
entry into host
infection of host
damage to host

40

what is primary sources of dental practice

resp trat and muht
secretions saliva and blood

41

what is the secondary source of dental practise

surgery equipment
drill mirror

42

what are some challenges faced by pathogenic bac in water

low temp
low nutrient
pH neutral
oxygen available
resp metab
free iron available
adhesins stick to rocks

43

what re some challenges faced by pathogenic bac in humans

higher temp 37C
energy higher
low pH then higher
low or no oxygen
fermentative metab
iron bound to harm
adhesions stick to cells
expo to bile salts

44

what do endogenous microbes do to survive

adapt to host and adhered more likely to poise a threat