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What is the principle behind immunization and vaccination?

1.	Immediate elimination of pathogens
2.	Use of physical barriers to prevent infections
3.	The memory of the immune system to produce antibodies on subsequent exposure
4.	Use of cytokines to block viral replication

Subtopic: Vaccination and Immunisation |

94%

Level 1: 80%+

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How is the hepatitis B vaccine commonly produced?

1.	By using live, attenuated hepatitis B virus
2.	By using recombinant DNA technology to produce antigenic polypeptides of the virus in yeast
3.	By extracting antibodies from infected individuals
4.	By using inactivated viral particles obtained from infected patients

Subtopic: Vaccination and Immunisation |

87%

Level 1: 80%+

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