Question

An example of an infectious disease is:

1-sickle cell anemia
2-small pox
3-Down syndrome
4-diabetes

Answer 1

I think the answer is :
2-small pox
Because it is the only one that can infect others by contact

Answer 2

Small pox is the answer

Explanation: Down Syndrome is something your born with

Sickle Cell Anemia is inherited from your parents

Diabetes comes from your diet

Small Pox is the only one that is a virus that is similar to the flu