GCSE Biology - What Are Vaccines? Are They Safe? How Do They Work? Vaccines Explained #39

The video explains how vaccines work by exposing the immune system to weakened or inactivated pathogens, allowing the body to develop immunity without causing disease. Vaccines protect individuals and communities by preventing the spread of diseases, contributing to herd immunity. While vaccines are generally safe and effective, they may not always provide full immunity and can occasionally cause mild side effects. The benefits of vaccination, such as controlling diseases and preventing epidemics, typically outweigh the risks.

What is the primary function of a vaccine?

• To cure diseases

• To expose the body to a disease

• To develop immunity without causing the disease

• To strengthen the disease-causing pathogens

Which of the following diseases have vaccines helped control?

• Diabetes

• Common cold

• Polio

• Asthma

What is herd immunity?

• Immunity developed by a single person

• Immunity that spreads from animals to humans

• Immunity that lasts for a lifetime

• Immunity in a population that prevents disease spread

What is a common issue with vaccines?

• They are always 100% effective

• They sometimes don't provide full immunity

• They never work

• They always cause severe reactions

What is a rare but severe reaction to vaccines?

• Mild headache

• Seizures

• Slight fever

• Runny nose