Fact 1: Immunity results from immunization.

Fact 2: Immunization with vaccine is effective.

Given the two facts above, answer the question "What can vaccines do?" with the following options: 
- cause euphoria
 - major threat to health
 - it protects them
 - protect plants
 - Keep someone from disease
 - cause a disease
 - cause a vasectomy
 - rapid expansion


 

     Keep someone from disease    