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1

source of infecting agent

Reservoir

2

means by which humans may acquire microorganisms

Mode of Transmission

3

living entity that transmit microorganism from the reservoir to host

Vectors

4

nonliving entity that transmit microorganism from the reservoir to host

Vehicle or Fomite

5

Identify bacteria present in Chicken



– Salmonella spp.

6

Identify bacteria present in Rat’s urine

– Leptospira interrogans (cause of leptospirosis)

7

Identify bacteria present in Cat’s scratch –

Bartonella henselae

8

Identify bacteria present in Tick in rats –

Yersinia pestis

9

fever caused by ticks

*Rocky Mountain Spotted Fever –

10

Many fungal agents are acquired by ??? of soil and dust particles containing microorganisms and through ???

inhalation
penetration of wounds

11

Factors that Cause Diseases

1. Status of host’s immune system
2. Protection from microbial invasion
3. Inherent microbial factors

12

Types of Microbial Flora
- commonly found on or in body sites
-beneficial: compete against pathogenic bacteria for nutrients and space so these pathogens won’t be able to use it to their advantage
-overpopulate so pathogens will not be able to live at a certain site of the body

1. Normal, usually indigenous flora

13

Types of Microbial Flora
colonize an area for months/years

resident

14

hosts with pathogenic organism but not manifesting symptoms, capable of transmitting infections

carrier

15

Types of Microbial Flora
present at a site temporarily

transient

16

bacteria always present on skin/nose

Staphylococcus aureus

17

infection caused by microbes with low virulence but becomes pathogenic in a host with low immunologic response

Opportunistic infection

18

Composition of Microbial Flora at Different Body Sites
Skin


sebaceous/sweat glands, squamous cells (keep on shedding/dislodging bacteria)

19

Composition of Microbial Flora at Different Body Sites
mouth

low redox potential at tooth surfaces (anaerobes)

20

Composition of Microbial Flora at Different Body Sites
Respiratory tract

alveolar macrophages
delivery of air from the outside of body to pulmonary tissues

21

Composition of Microbial Flora at Different Body Sites
Sweat

contains lysozymes which destroy bacterial cell wall

22

found in sweat, destroys bacterial cell wall

lysozymes

23

found in respiratory tract, phagocytose

alveolar macrophages

24

Composition of Microbial Flora at Different Body Sites
GIT

gastric acidity

25

PATHOGENESIS OF INFECTIOUS DISEASES (2)

a. Suppression by immunosuppressive drugs, chemotherapy or radiation
b. Individuals with lymphoma, leukemia, chronic illnesses, cirrhosis

26

invasion of a pathogen with structural or functional harm, characterized by signs and symptoms

*Infectious diseases

27

bacteria in oyster

Vibrio cholera

28

invasion or growth of a pathogen

Infection

29

infection which develop quickly

Acute infection

30

infection which develop and progress slowly, sometimes in a period of years

Chronic infection

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