Boca Christian
Germ Busters
Experiment by Theresa and Ashley, Grade 7
Entered in the 1999/2000 Science Fair
Science Fair Project
Problem
Does anti-bacterial soap kill more germs than regular soap?
Hypothesis
Anti-bacterial soap kills more germs than regular soap.
Procedure
We first rubbed our hands together to spread the germs evenly.  Then we rubbed our right hand on an agar dish.  Then we washed our hands with one tablespoon anti-bacterial soap for fifteen seconds.  We dried our hands by patting them on paper towels.  Then we rubbed our right hand on another agar dish.  Then we rubbed our left hand on another agar dish.  Then we washed our hands with one tablespoon of regular soap for fifteen seconds.  We dried our hands by patting them on paper towels.  Then we rubbed our left hand on another agar dish.  We put the dishes in an incubator in the lab at the hospital so the germs could grow.  After twenty-four hours we counted the germs on the dishes to find out the percentage of germs each soap killed.
Results
The first three tests were inaccurate because there were variables which caused an increase in germs.  In the fourth test, the anti-bacterial soap had a 70% decrease and the regular had a 50% decrease.  In the fifth test the anti-bacterial soap had a 95% decrease and the regular soap had a 50% decrease.  In the sixth test the anti-bacterial soap had a 95% decrease and the regular soap had an 85% decrease in germs.
Conclusion
Our data supports the conclusion that anti-bacterial soap kills more germs than regular soap.