Understanding Live Attenuated Vaccines

The video explains how the immune system defends against pathogens and the role of vaccines, particularly live attenuated vaccines, in preparing the immune system for future attacks. It discusses the historical development of vaccines, such as the smallpox vaccine, and provides examples like the polio and BCG vaccines. The video also outlines the advantages and disadvantages of live attenuated vaccines, emphasizing their strong immune response and potential side effects.

What is the primary role of the immune system when dealing with pathogens?

• To weaken the body

• To store pathogens for future use

• To protect the body against external pathogens

• To create new pathogens

How do vaccines help the immune system?

• By storing pathogens in the body

• By confusing the immune system

• By weakening the immune system

• By making the immune system more knowledgeable about potential threats

What is a live attenuated vaccine?

• A vaccine made from synthetic materials

• A vaccine made from dead pathogens

• A vaccine made from weakened pathogens

• A vaccine made from active pathogens

How is a virus attenuated for use in vaccines?

• By mixing it with other viruses

• By storing it in the body

• By chemically inactivating it

• By making it more active

What historical event led to the development of the smallpox vaccine?

• The invention of the microscope

• The discovery of antibiotics

• The observation of milkmaids with cowpox

• The eradication of polio

Who developed the polio vaccine using live attenuated virus?

• Alexander Fleming

• Louis Pasteur

• Albert Sabin

• Edward Jenner

What is a major advantage of live attenuated vaccines?

• They are difficult to produce

• They require multiple booster doses

• They provide a strong immune response

• They are expensive

What is a potential risk associated with live attenuated vaccines?

• They can cause the disease they are meant to prevent

• They require refrigeration

• They are ineffective

• They are too expensive

Why are live attenuated vaccines still used in developing countries?

• They are not available

• They are difficult to administer

• They are inexpensive and do not require booster doses

• They are ineffective

What is the main reason live attenuated vaccines are not preferred in some cases?

• They are too cheap

• They have a risk of causing side effects

• They are not available

• They are too effective