Changes

Adjuvants decrease the number of injections needed and the amount of antigen that needs to be administered, but they have been associated with vaccine reactions.

Adjuvants decrease the number of injections needed and the amount of antigen that needs to be administered, but they have been associated with vaccine reactions.

===Marker Vaccines===

==Marker Vaccines==

 

Marker vaccines distinguish infected from vaccinated animals in disease control programmes.

*Distinguish infected from vaccinated animals

They contain a deleted protein or gene; vaccinated animals cannot make antibody to the missing protein whereas infected animals can and this helps immunosurveillance for animals infected by an organism in countries that vaccinate against that disease.

 

*Have a deleted protein or gene

 

*Vaccinated animals cannot make antibody to the missing protein whereas infected animals can

 

*Helps immunosurveillance for animals infected by a virus in countries that vaccinate against the virus

==Which type of vaccine is used for each disease?==

==Which type of vaccine is used for each disease?==