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[[Image:Passive Immunisation.jpg|thumb|right|150px|Passive Immunisation - Copyright nabrown RVC]]
[[Image:Passive Immunisation.jpg|thumb|right|150px|Passive Immunisation - Copyright nabrown RVC]]
'''Passive immunisation'''
'''Passive immunisation'''
*Advantages:
**Immediate protection
*Disadvantages:
**Short duration of action
***Temporary protection by the administration of preformed antibody from another individual of the same or of a different species
***The aquired antibodies are used in combination with antigen and catabolised by the body meaning protection is gradually lost
**Injection of antiserum may cause an allergic response
**Antiserum contains many antibodies not just the specific antobodies needed
*Administer antibodies
*Administer antibodies
**Maternally-derived antibodies in colostrum
**Maternally-derived antibodies in colostrum
**Antiserum (artificial)
**Antiserum (artificial)
***The antigen (and often an adjuvant) is injected into the host animal
*Immediate protection
***The immune system of that animal synthesised antibodies
***Repeated injections at intervals increases the total antibody production
*Short duration of action
***The immunised animal is bled and the serum collected which contains the newly made antibodies. The serum is called '''antiserum'''.
***The serum can then be injected into a different animal to confer passive immunisation
*Example of when passive immunisation is used:
*Example of when passive immunisation is used: