Fact 1: Viruses often infect bacteria.

Fact 2: Influenza viruses are restless.

Given the two facts above, answer the question "What can infect bacteria?" with the following options: 
- heat or cold
 - bioaerosols
 - burning coal
 - white vinegar
 - harm them
 - vinegar
 - influenza
 - fungi


 

       influenza  