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Dhaka, Bangladesh
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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 the chains of transmission of an infectious agent because most of the population is resistant to infection through immunization or prior natural infection”
HERD STRUCTURE: (IT INCLUDES-)
Human population Animal reservoir or host Insect vector Environmental factors Social factors
CONCEPTS BEHIND HERD IMMUNITY
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
Tansmission block of the disease
No disease
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
FACTORS THAT AFFECT HERD IMMUNITY:
A. Demographic : large number of births how are not prooerly immunized
B. Health care facilitiesC. Social & political factors
War CycloneFamineEconomic disruption
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