- Decreasing something negative has a positive impact on a thing
- Illness has a negative impact on an organism 's health
- Therefore, decreasing illness has a positive impact on an organism's health

- Decreasing illness has a positive impact on an organism's health
- Preventing something decreases the amount of that something
- So, preventing illness has a positive impact on an organism's health

- Preventing illness has a positive impact on an organism's health
- Vaccines can help prevent illness
- Hence, vaccines have a positive impact on an organism's health by helping to prevent illness

- Vaccines have a positive impact on an organism's health by helping to prevent illness
- Having a positive impact on something helps that something
- Hence, vaccines help organisms by helping to prevent illness

So, vaccines help organisms by helping to prevent illness
Question
New vaccines for diseases are being developed all the time. How do vaccines most likely help people?

Context
- Having a positive impact on something helps that something 
- Decreasing something negative has a positive impact on a thing 
- Illness has a negative impact on an organism 's health 
- Preventing something decreases the amount of that something 
- Vaccines can help prevent illness