Presented By:
Dr.Md.Salequr Rahman
Dep. of Community Medicine
 Oxford Text book of public health
“ It is the relative protection of a
population group achieved by reducing or
breaking...
HERD STRUCTURE: (IT INCLUDES-)
 Human population
 Animal reservoir or host
 Insect vector
 Environmental factors
 Soc...
CONCEPTS BEHIND HERD IMMUNITY
MACHANISOM:
Immunization of 70-80% people
Remainder 20-30% are either cases or susceptibles
Scanty number of primary cases...
Tansmission block of the disease
No disease
HOW HERD IMMUNITY CAN BE ACHIEVED:
 Immunization
 Clinical & sub-clinical infection
 Elimination of insect vector
 Eli...
FACTORS THAT AFFECT HERD IMMUNITY:
A. Demographic : large number
of births how are not prooerly
immunized
B. Health care f...
Herd immunity 1234
Herd immunity 1234
Herd immunity 1234
Herd immunity 1234
Herd immunity 1234
Herd immunity 1234
Herd immunity 1234
Herd immunity 1234
Herd immunity 1234
Herd immunity 1234
Herd immunity 1234
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Herd immunity 1234

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Herd immunity 1234

  1. 1. Presented By: Dr.Md.Salequr Rahman Dep. of Community Medicine
  2. 2.  Oxford Text book of public health “ It is the relative protection of a population group achieved by reducing or breaking the chains of transmission of an infectious agent because most of the population is resistant to infection through immunization or prior natural infection”
  3. 3. HERD STRUCTURE: (IT INCLUDES-)  Human population  Animal reservoir or host  Insect vector  Environmental factors  Social factors
  4. 4. CONCEPTS BEHIND HERD IMMUNITY
  5. 5. MACHANISOM: Immunization of 70-80% people Remainder 20-30% are either cases or susceptibles Scanty number of primary cases Frequency of secondary case development decreases Eventually secondary case development becomes nil
  6. 6. Tansmission block of the disease No disease
  7. 7. HOW HERD IMMUNITY CAN BE ACHIEVED:  Immunization  Clinical & sub-clinical infection  Elimination of insect vector  Elimination of animal reservoir  Provision of safe water supply  Provision of sanitary disposal of fefuse & sewage  Provision of proper nutrition
  8. 8. FACTORS THAT AFFECT HERD IMMUNITY: A. Demographic : large number of births how are not prooerly immunized B. Health care facilities C. Social & political factors War Cyclone Famine Economic disruption

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