Fact 1: Disease-causing microbes have a negative impact on the body.

Fact 2: Harmful microbes that cause diseases are called pathogens.

Given the two facts above, answer the question "What effect do pathogens have." with the following options: 
- Something with a head, thorax, and abdomen
 - none
 - healing
 - single-celled organisms
 - a negative impact on the body
 - influenza orthomyxoviruses
 - good health
 - depress neuronal excitability


 

     a negative impact on the body    