1. Which of the following is the smallest in size?

2. Viruses are typically smaller than the pores in most masks.

3. The use of masks to reduce the spread of influenza is a highly ineffective method.

4. Surgeons wear masks during surgery to prevent the spread of pathogens to their patients.

5. Wearing a typical mask kills all pathogens that leave the person before the pathogens can enter the air.

6. Influenza is best described as being a viral infection.

7. A mask traps some pathogens from leaving a person before the pathogens can enter the air.

8. Masks protect which part of the human body from an influenza infection entering the body?