vaccines

• antibodies are proteins that bind to specific antigens on pathogens
• vaccines

  1. inject a weakened version ( can’t cause disease ) of the antigen into the body
  2. our white blood cells produce antibodies against antigen which create immunity
• pros

  1. protection from disease
  2. control of common disease
  3. prevent outbreaks of disease
  4. herd immunity
• herd immunity

  1. the majority of people are made immune to the disease and can no longer spread it
  2. over time this means the disease can die out
• cons

  1. dont always work
  2. bad reactions to the vaccine