Clostridium tetani because it's a widespread bacteria found in soil all around the world
I think its the hormones in the body <span />
<span>1) Denial
2) Anger
3)Bargaining
4) Depression
5)Acceptance
</span>
Alessandro forgot to think of the practicality of the lifestyle change. It wasn't practical since he couldn't even get through a week before he had to stop due to something. Instead, Alessandro should ride before or after school so nothing will stop him from making a change.