Vaccination

• What is the main topic of the video?

  How vaccines work
• What happens to our immune system after exposure to a pathogen?

  It develops immunity to that pathogen
• Why do we only catch chickenpox once?

  Because we become immune after the first infection
• What would be ideal regarding exposure to pathogens?

  To gain immunity without catching the disease
• What do vaccines contain?

  Weakened or inactivated pathogens
• How does the body respond to the antigens in vaccines?

  By producing antibodies and developing immunity
• How many diseases are we vaccinated against by primary school?

  More than a dozen diseases
• What is the main pro of vaccines?

  They protect us from horrible diseases
• What larger effect do vaccines have on disease control?

  They help control common diseases
• What is herd immunity?

  When enough people are immune to a pathogen
• How does herd immunity prevent disease spread?

  The pathogen has no hosts to spread to
• What happens to a pathogen when the host overcomes the disease?

  The pathogen disappears
• What are the common problems associated with vaccines?

  They may not grant full immunity or cause reactions
• What is a common reaction to vaccines?

  Swelling around the injection site
• What severe reactions can vaccines cause?

  Fever or seizures
• How common are bad reactions to vaccines?

  They are pretty rare
• What is the overall conclusion of the video?

  Vaccines are useful for preventing diseases