Vaccination: Protects you from future infections
When you are infected with a new microorganism it takes your white blood cells a few days to learn how to deal with it, so you're ill for that amount of time. Vaccinations involve injecting small amounts of dead or inactive microorganisms that carry antigens which cause your body to produce antibodies to attack them even though the microorganism is harmless. For example: MMR vaccine covers measles, mumps and rubella. But if live microorganisms appear after that your white blood cells can mass-produce antibodies specific to that pathogen. However some vaccinations wear off after time so booster injections are needed.
- Vaccines have helped control lots of infectious diseases that were once common (e.g. polio, measles, whooping cough..). Polio infections have decreased by 99%.
- Big outbreaks of disease - epidemics - can be prevented if a large percentage of the population is vaccinated and is unlikely for the disease to be passed on.
- Vaccines dont always work and sometimes dont give you immunity.
- You can sometimes get bad side effects from the vaccine, e.g. fever, swelling, seizures, however these are very rare.