http://www.cdc.gov/vhf/ebola/exposure/risk-factors-when-evaluating-person-for-exposure.html
Updated: October 27, 2014
The following epidemiologic risk factors should be considered when evaluating a person for Ebola virus disease (Ebola), classifying contacts, or considering public health actions such as monitoring and movement restrictions based on exposure.
1. High risk includes any of the following:
Percutaneous (e.g., needle stick) or mucous membrane exposure to blood or body fluids of a person with Ebola while the person was symptomatic,
Exposure to the blood or body fluids (including but not limited to feces, saliva, sweat, urine, vomit, and semen) of a person with Ebola while the person was symptomatic without appropriate personal protective equipment (PPE),
Processing blood or body fluids of a person with Ebola while the person was symptomatic without appropriate PPE or standard biosafety precautions,
Direct contact with a dead body without appropriate PPE in a country with widespread Ebola virus transmission,
Having lived in the immediate household and provided direct care to a person with Ebola while the person was symptomatic
2. Some risk includes any of the following:
In countries with widespread Ebola virus transmission: direct contact while using appropriate PPE with a person with Ebola while the person was symptomatic
Close contact in households, health care facilities, or community settings with a person with Ebola while the person was symptomatic
Close contact is defined as being for a prolonged period of time while not wearing appropriate PPE within approximately 3 feet (1 meter) of a person with Ebola while the person was symptomatic
3. Low (but not zero) risk includes any of the following:
Having been in a country with widespread Ebola virus transmission within the past 21 days and having had no known exposures
Having brief direct contact (e.g., shaking hands) while not wearing appropriate PPE, with a person with Ebola while the person was in the early stage of disease
Brief proximity, such as being in the same room for a brief period of time, with a person with Ebola while the person was symptomatic
In countries without widespread Ebola virus transmission: direct contact while using appropriate PPE with a person with Ebola while the person was symptomatic
Traveled on an aircraft with a person with Ebola while the person was symptomatic.
4. No identifiable risk includes:
Contact with an asymptomatic person who had contact with person with Ebola
Contact with a person with Ebola before the person developed symptoms
Having been more than 21 days previously in a country with widespread Ebola virus transmission
Having been in a country without widespread Ebola virus transmission and not having any other exposures as defined above.
Article about it, what it means in actions.
http://www.nbcnews.com/storyline/ebola-virus-outbreak/cdc-tweaks-ebola-guidelines-travelers-n235011