5.7 Vaccines & Immunisation

What do vaccines do?

• They prevent us from ever being exposed to pathogens.

• They expose us to the pathogen and give us immunity without causing the disease.

• They cure diseases after we catch them.

• They make us sick to build immunity.

What happens once our immune system has been exposed to a certain pathogen?

• It generally develops immunity to that pathogen.

• It stops functioning.

• It becomes weaker.

• It always causes a severe reaction.

Why do we only catch diseases like chickenpox once?

• Because the pathogen mutates.

• Because we take medication.

• Because our immune system develops immunity after the first exposure.

• Because the disease disappears after the first infection.

What is inside a vaccine?

• Healthy cells.

• Active pathogens.

• Weakened or inactivated pathogens.

• Antibodies.

Why do our bodies respond to weakened pathogens in vaccines?

• Because they still contain the same antigens as the proper pathogens.

• Because they are completely different from the actual pathogens.

• Because they are stronger than the actual pathogens.

• Because they are harmless.

How many diseases are we typically vaccinated against by the time we start primary school?

• About ten.

• More than a dozen.

• Only one.

• Less than five.

What is one of the main pros of vaccines?

• They protect us from catching horrible diseases.

• They make us immune to all diseases.

• They cure existing diseases.

• They have no side effects.

What is herd immunity?

• When a disease is eradicated.

• When everyone in a population is vaccinated.

• When enough people in a population are immune to a pathogen, preventing its spread.

• When a pathogen mutates and becomes harmless.

Tags

NGSS.HS-LS2-8

What is a potential con of vaccines?

• They make diseases worse.

• They always cause severe reactions.

• They don’t always work.

• They are ineffective against all pathogens.

What is a more common problem with vaccines?

• They never work.

• They always cause fevers.

• Bad reactions such as swelling around the injection site.

• They cause the disease they are meant to prevent.