Fact 1: Immunodeficiency occurs when the immune system is not working properly.

Fact 2: People with healthy immune systems usually get well on their own.

Given the two facts above, answer the question "What does immunodeficiency do?" with the following options: 
- enormous damage to homes
 - Make money
 - major threat to health
 - harm them
 - Plant growth is reduced
 - Stay sick shorter
 - Stay sick longer
 - Get well faster


 

       Stay sick longer  