مواضيع المحاضرة: The extent of the spread of an infection agent in the body and length of time between exposures to the agent on onset of disease symptoms which called "Incubation period. e.g. typhoid fever disease many as 10.000 peoples that exposure in 1963 in Switze
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Nursing College – Mosul 

University


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Entry of pathogens:

The extent of the spread of an infection agent 

in  the  body  and  length  of  time  between 
exposures  to  the  agent  on  onset  of  disease 
symptoms which called  "Incubation period. e.g. 
typhoid  fever  disease  many  as  10.000  peoples 
that exposure in 1963 in Switzerland by drinking 
water contaminated with Sal. typhi the cause of 
the  disease  the  long  I.P.  of  the  disease  10-14 
days allowed widespread .


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Respiratory tract system:

e.g. mumpsmeaslesStreptococcus, etc.

Digestive tract :

such as Clostridium perfringens(welchii ),Salmonella
typhi 
Strep. Spp.

Urinary Tract

:e.g. E .coli Klebssiella, Proteus.

Genital tract

:e.g. Gonococcus infection by N gonorrhea,

Trichomonasis

disease

by

Trichomonas

vaginlis

or

Syphilis cause by Treponema palladium.

Through skin

:. E.g. Gas gangrene cause by Clostridium

welchii or. Cl. tetani, Staph. Aurous, Smallpox virus, and
Herpes virus.

The route of any infectious agent:


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Communicable disease:

•Communicable disease are infectious 
disease  when  the  source  of  infection 
is human (man) e.g. measles, mumps, 
hepatitis,  AIDS,  but  sometimes  not 
human

e.g. 

brucellosis, 

toxoplasmosis, tetanus. 
•Period  of  communicability  is  the 
time  of  transfer  of  pathogenic 
microorganism to form disease

.


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Types of communicable disease

:

•Pathogenic microorganisms transmitted through
mucous membrane stick on it and causing fever
e.g. Diphtheria, measles, mumps.
• Late incubation period- clinical course-
convalescent- post convalescent period. (few
days-

several

weeks)

e.g.

poliomyelitis,

typhoid.
•Disease transmitted by sucking of arthropod
period (the period when the microorganism
found in blood) e.g. malaria, Leshmania, typhus
fever, yellow fever

.


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Communicable disease occur in every country,
every urban and rural area, and in every
neighborhood from the very rich to the very
poor. Nurses who provide care in combating
communicable disease must have a basic
understanding

of

epidemiology

infection

control, microbiology, medicine, public health
and nursing. Furthermore the community nurse
must be having knowledge of the legal system
which mandates prevention and control of
communicable disease locally, nationally, and
worldwide.


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Applied of epidemiologic Principles 
and Methods:

Epidemiology began as the study of
communicable disease affecting large
population. Although the scope of
epidemiology has expanded to include
noncommunicable disease and other
health-related

issues,

epidemiologic

principles are still the backbone of
communicable disease control

.


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Preventing communicable disease begins 
with knowledge about:                  

▪The links in the chain of infection. 
▪The relationships and interactions among -

-

The infectious agent (causative 

microorganism ) 

-

The host (human or animal incubating the 

agent ).

-

The environment (i.e., the epidemiology 

triangle).


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Communicable disease control depends  

on:

1.

Discovering the weak link in the triangle.

2. Developing measures that attack and 

reduce or eliminate that threat.

3. Control efforts include prevention 

activities and efforts to reduce the 
seriousness of  an illness as measured by 
severity, the length of illness , the cost of 
treatments , the short- and long-term 
effects, and the risk of death


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Communicable Disease Investigation:

In accordance with epidemiologic 
principles, communicable disease 
investigation involves five steps:

1-

Identify the disease. 

2-

Isolated the causative agent.

3-

Determine the method of transmission.

4-

Establish the susceptibility of the 

population at risk.  

5-

Estimate the impact on the population.


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Causative agent: Pathogenicity, invasiveness, virulence
and active inactive dose.
Means of transmission: Direct or indirect contact,
source to a new host or carrier droplets etc.
Characteristic of host: Immunity defense mechanisms
include tears, skin, mucus, saliva and cilia –hairs in nose,
also as natural or artificial

immunity, active or passive

immunity.
Environment:

Communicable

disease

control

as

temperature, humidity radiation, pressure, and ventilation
.By this can all be used to decrease the transmission of
infectious disease. Crowding, famine, and mobility of
people increase the possibility of spreading disease.


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Fig. 2.2 transmission 0f communicable disease


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Fig: 2.3 breaking the chain of infection in HIV and AIDS.


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Chickenpox

Vercella- Zoster 

Virus (VZV)

14-16 days

Diphtheria

Corynebacterium 

diphtheria

2-5 days

Pertusis

Bordetella pertusis

6-20 days

Whooping cough

German measles

Rubella virus, Rubivirus

14-21days

Measles/rubella

Rubeda virus

9-12 days

(paramyxovirus)

Mumps

Mumps virus

16-18 days

1: Respiratory Route:

Disease      

Causative agent         Incubation peioroid


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Mumps

Mumps virus

16-18 days

Tuberculosis (TB)

Myco. 

tuberculosis

(d) several weeks

Influenza

virus , (flu)

1-2 days

Mononucleosis

Epstein- Barr 

virus

2 weeks

Kissing disease

(EPU)

Influenza

Hemophilus 

influenzae

less than 10 days

Erthema infectious 

Illness rash

Week-months

Scarlet fever

B- hemolytic 

Streptococcus

3-6 days


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Impetigo

Group A 

Streptococcus or 

Staphylococcus

4-10 days

Pediculosis

Parasitic lice

Lice 10 days

Scabies

Parasitic mite

Long as eggs or 

mites are alive

Tetanus

Clostridium tetani

Ally 8 days

2: IntegumentaryRoute:


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Poliomyelitis

Poliovirus

6-20 days

Salmonellosis

Salmonella typhior 

Sal. paratyphi

7-10 days

Shigellosis (Bacillary 

Dysentery)

Shigella spp.

(week) depend 

on serotype

Intestinal parasites

(round worms and 

pinworms

Months or more

Toxoplasmosis

Toxoplasma gondii

Long periodic

(protozoa)

Latent phase

Hepatitis A ( HAV )

Hepatitis A virus

15-40 days

3:

Gastrointestinal Route:


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Hepatitis B ( 

HBV )

Hepatitis B virus 

(HBV)

1-6 months

AIDS

Human 

immunodeficiency 

Virus (HIV)

2-10 years 

Before AIDS

4 :

Serum Route

:


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5:

Sexually Transmitted Route

:

Herpes

Herpes simplex 

virus(HSV-1) (HSV-2)

2-12 days After 

exposure

Cytomegalovirus(Mon

onucleosis)

(CMV)

6 months

Venereal warts or HPV

Papiloma virus

1-3 months

Gonorrhea

Neisseria  gonorrhea

2 days-3 weeks

Chlamydia

Chlamydia spp.

5 days- longer

Syphilis

Treponemapallidum

3-6 weeks


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Disease:

Disease is Latin word mean dis = lack, ease = power mean 
lack of power or discomfort. Disease defines as abnormal 
state in which body physiology can't restore body comfort. 
Any disease results from end of two forces:

Force of agent depend on

:

Type of agent.
Virulence factor of agent
Dose of infected agent

.

Force of host depend on :

Nonspecific resistance.
Natural immunity
Acquired immunity

.


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Force of host

Force of agent

End results

Very high

Very low

No disease

High

Low

Subclinical 

without

Mild

Mild

Sign and symptom

Low

High

Moderate or 

severe disease

Very low

Very high

Fulminate (very 

sever disease)

Low

Rapid Exotoxins large

death


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Disease Investigation

Establish diagnosis
Identify specific agent
Describe according to person, place 
and time
Identify source of agent
Identify mode of transmission
Identify susceptible populations


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End result of the disease:

1. Complete recovery.
2. Clinical case (carrier).
3. Recovery with defect.
4. Death.

Incubation period start from the entrance 
of micro-organisms to the body until the 
appearance of sign a symptoms, (clinical 
cores of disease the appearance of sign 
and symptoms).




رفعت المحاضرة من قبل: Hussein Mohammed Alhaksah
المشاهدات: لقد قام 3 أعضاء و 159 زائراً بقراءة هذه المحاضرة








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