A vaccine is given by a doctor or nurse and makes a person less likely to get a
Vaccines are usually made from something that is
The word "vaccine" comes from the Latin words vaccīn-us (from the word vacca, meaning "
Edward Jenner created the first vaccine in the 1770s. At this time,
To test this idea, Jenner
Because cowpox inoculation made fewer people sick than smallpox inoculation, England made smallpox inoculation
Many countries have passed compulsory vaccination laws - laws that require certain people to get vaccinated.
 For example, in many countries, children have to be vaccinated against certain diseases in order to go to