Multiple choice question

People with very risky exposures such as nurses stuck with a needle that had been used on an Ebola patient or doctors splashed in the face with infectious bodily fluids. 

People in close contact with a patient without protective gear. 

Travelers to an affected country or people who were near a patient but didn't care for him while he has symptoms or caregivers who wore protective gear. 

People in contact with a patient before she showed symptoms or who traveled to an affected country more than 21 days ago.