What do vaccines do?
Vaccines expose the immune system to a small amount of a disease so that the immune system learns how to fight it. This prevents the patient from getting the actual disease in the future
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What do vaccines do?
### Input: 
### Response: Vaccines expose the immune system to a small amount of a disease so that the immune system learns how to fight it. This prevents the patient from getting the actual disease in the future