Fact 1: Scraping oneself on a contaminated object may cause infection.

Fact 2: Germs can contaminate surfaces and objects around the water.

Given the two facts above, answer the question "Which of the following may cause infection?" with the following options: 
- influenza
 - Sterilized objects
 - chickenpox
 - eukyarotes
 - Processed bacteria
 - Thorough precautions
 - Germy surfaces
 - viruses


 

       Germy surfaces  