3.2.4 Understanding Vaccines and Immunity

Front

What is the primary purpose of vaccines?

Back

To provide protection against diseases

Answer explanation

The primary purpose of vaccines is to provide protection against diseases by stimulating the immune system to recognize and fight pathogens, rather than curing diseases or diagnosing them.

Front

Herd immunity

Back

Immunity that occurs when a large portion of a population becomes immune to a disease

Answer explanation

Herd immunity occurs when a significant portion of a population becomes immune to a disease, either through vaccination or previous infections, reducing the spread and protecting those who are not immune.

Front

Which of the following best describes active immunity?

Back

Immunity developed after exposure to a disease or through vaccination

Answer explanation

Active immunity is best described as immunity developed after exposure to a disease or through vaccination, as it involves the body's own immune response to pathogens or vaccines.

Front

Example of passive immunity: Vaccination against measles, Antibodies received from mother's milk, Recovery from chickenpox, Immunity developed after a flu infection

Back

Antibodies received from mother's milk

Answer explanation

Passive immunity occurs when antibodies are transferred from one individual to another. Antibodies received from mother's milk provide immediate protection to the infant, making it an example of passive immunity.

Front

What is one ethical issue associated with the use of vaccines?

Back

Mandatory vaccination policies may infringe on personal freedoms

Answer explanation

Mandatory vaccination policies can raise ethical concerns as they may limit individual autonomy and personal freedoms, leading to debates about the balance between public health and individual rights.

Front

Which of the following is NOT a benefit of herd immunity?

• Protects those who cannot be vaccinated
• Reduces the spread of contagious diseases
• Guarantees individual immunity for everyone
• Helps prevent outbreaks

Back

Guarantees individual immunity for everyone

Answer explanation

Herd immunity protects the community but does not guarantee individual immunity for everyone. Some individuals may still be susceptible to diseases despite high vaccination rates.

Front

How does active immunity differ from passive immunity?

Back

Active immunity involves the production of antibodies by the immune system, while passive immunity involves receiving antibodies from another source.

Answer explanation

Active immunity is generated by the immune system producing its own antibodies, often through infection or vaccination. In contrast, passive immunity involves receiving antibodies from another source, providing immediate but temporary protection.

Front

Common misconception about vaccines?

Back

Vaccines can cause autism

Answer explanation

The belief that vaccines can cause autism is a common misconception. Extensive research has shown no link between vaccines and autism, while vaccines are proven to be safe and effective in preventing diseases and achieving herd immunity.

Front

What is the role of the immune system in active immunity?

Back

To produce its own antibodies in response to an antigen

Answer explanation

The immune system's role in active immunity is to produce its own antibodies in response to an antigen, allowing for a targeted defense against pathogens, unlike passive immunity which involves receiving antibodies from another source.

Front

Why might some individuals be unable to receive vaccines?

Back

They have a compromised immune system

Answer explanation

Individuals with a compromised immune system may be unable to receive vaccines due to the risk of adverse reactions or insufficient immune response. This makes them a vulnerable group in vaccination scenarios.