COMMUNITY HEALTH NURSING I FOR II YEAR B.SC(N)

2. DYNAMICS
OF
DISEASE
TRANSMISSION

3. DYNAMICS OF DISEASE
TRANSMISSION:
RESERVOIR
MODE OF
TRANSMISSION
SUSCEPTIBLE
HOST

4. 1.RESERVOIR
 IT IS DEFINED AS “ANY
PERSON, ANIMAL,
ANTHROPOD, PLANT,
SOIL OR SUBSTANCE
IN WHICH AN
INFECTIOUS AGENT
LIVES AND
MULTIPLIES.

5. HOMOLOGOUS RESERVOIR
MAN → MAN

6. HETROLOGOUS RESERVOIR
ANIMALS HUMAN

7. TYPES OF RESERVOIR
 HUMAN
RESERVOIR
 THE MOST
IMPORTANT SOURCE
OR RESERVOIR OF
INFECTION IS MAN
HIMSELF. HE MAY BE
A CASE OR CARRIER.

8. CASES:
◦ Individual with particular disease due to
presence of infectious agent.
1. CLINICAL CASE
2. SUBCLINICAL CASE
3. LATENT CASE

9. CLINICAL CASE

10. SUBCLINICAL CASE
 THE DISEASE AGENT
MAY MULTIPLY IN
THE HOST BUT DOES
NOT MANIFEST
ITSELF BY SIGNS
AND SYMPTOMS.

11. LATENT CASES
 THE HOST DOES NOT SHED
THE INFECTIOUS AGENT
WHICH LIES DORMANT
WITHIN THE HOST
WITHOUT SYMPTOMS( AND
OFTEN WITHOUT
DEMONSTRABLE
PRESENCE IN BLOOD AND
OTHER BODILY
SECRETIONS)

12. CARRIERS
 “ AN INFECTED PERSON
OR ANIMAL THAT
HARBOURS A SPECIFIC
INFECTIOUS AGENT IN
THE ABSENCE OF
DISCERNIBLE CLINICAL
DISEASE AND SERVE AS
A POTENTIAL SOURCE
OF INFECTION TO
OTHERS

13. CARRIERS
TYPES
PORTAL
OF EXITDURATION

14. ACCORDING TO TYPES:
INCUBATORY CARRIERS
CONVALESCENT CARRIERS
HEALTHY CARRIERS

15. ACCORDING TO DURATION:
 TEMPORARY CARRIER
 CHRONIC CARRIER

16. PORTAL OF EXIT:

17. ANIMAL RESERVOIR

18. RESERVOIR IN NON- LIVING
THINGS

19. 2. MODE OF TRANSMISSION
 DIRECT TRANSMISSION
 INDIRECT TRANSMISSION

20. DIRECT TRANSMISSION
DIRECT CONTACT:
 SKIN TO SKIN CONTACT
BY TOUCHING, KISSING,
OR SEXUAL INTER
COURSE

21. DROPLET INFECTION:

22. TRANSPLACENTAL TRANSMISSION

23. INNOCULATION INTO SKIN

24. CONTACT WITH SOIL

25. INDIRCT TRANSMISSION
FLIES
FOMITES
FINGERSFAECES
FOOD

26. VEHICLE BORNE TRANSMISSION

27. VECTOR BORNE TRANSMISSION

28. AIR BORNE TRANSMISSION

29. FOMITES BORNE TRANSMISSION

30. UNCLEAN HANDS AND FINGERS

31. 3. SUSCEPTIBLE HOST:
FOUR STAGES:
 PORTAL OF ENTRY
 SITE OF ELECTION
 PORTAL OF EXIT
 LOW GRADE
IMMUNITY

32. DISEASE CYCLE:
INCUBATION PERIOD
PRODROMAL PERIOD
FASTIGIUM
DEFERVESCENCE
CONVALESCENCE
DEFECTION