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Ebola Virus Disease Survivors: Clinical and Immunologic Follow-up

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ClinicalTrials.gov Identifier: NCT02431923
Recruitment Status : Recruiting
First Posted : May 1, 2015
Last Update Posted : December 28, 2017
Information provided by (Responsible Party):

Study Description
Brief Summary:


- Ebola is a lethal disease. A lot is still unknown about Ebola and its long-term effects. Researchers want to learn what ill health conditions Ebola survivors have. They want to learn if Ebola survivors can infect others in their household through close contact. They also want to learn if Ebola survivors are immune from getting Ebola again. To learn these things, they want to follow people in Liberia for 5 years.


- To learn how Ebola affects the health of survivors and the people they live with.


- People in Liberia who had Ebola in the past 2 years, who share a household with someone who had Ebola, or who got ill and went to an Ebola Treatment Unit but were sent home because they did not have Ebola.


  • Participants will be screened with family illness history, physical exam, and blood tests. They may have an eye exam.
  • Ebola survivors and those who went to a Treatment Unit but did not have Ebola will visit a clinic at 3, 6, and 12 months, then every 6 months for 5 years. At each visit, they will repeat the screening tests.
  • Participants who live with someone who had Ebola will have only the screening visit. But they may be asked to return for follow-up visits. These visits will help researchers learn more about the differences between those who have had Ebola and those who have not.
  • Participants brought to the NIH Clinical Center will have documentation of positive Ebola virus PCR and a clinical syndrome compatible with acute EVD.
  • The study will last 5 years.

Condition or disease
Ebola Virus Disease

Detailed Description:
Between 1994 and the present, there have been several Ebola virus outbreaks affecting mostly countries in Central Africa. However, the 2014 West African outbreak significantly exceeds all previous outbreaks in geographic range and number of individuals affected. Ebola virus disease (EVD) is highly lethal with case fatality rates of 70-80% in the current West African outbreak. While the clinical manifestations of acute Ebola virus infection are well documented, little is known about long-term sequelae, ability to transmit Ebola, or long-term protective immunity in survivors from EVD. The purpose of this protocol is to study these questions in a cohort of EVD survivors from Liberia.

Study Design

Study Type : Observational
Estimated Enrollment : 7500 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Partnership for Research on Ebola Virus (PREVAIL) III: Ebola Natural History Study
Study Start Date : April 30, 2015
Estimated Primary Completion Date : May 31, 2025
Estimated Study Completion Date : January 1, 2030

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Ebola
U.S. FDA Resources

Groups and Cohorts

Outcome Measures

Primary Outcome Measures :
  1. To characterize the clinical sequelae seen in convalescent Ebola virus disease (EVD) patients. [ Time Frame: 10 years ]
  2. Assess whether convalescent EVD patients can transmit infection to household and sexual contacts as determined by development of EVD or Ebola seroconversion in contacts [ Time Frame: 10 years ]

Secondary Outcome Measures :
  1. Better define the immune response in EVD survivors. [ Time Frame: 10 years ]

Eligibility Criteria

Information from the National Library of Medicine

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Ages Eligible for Study:   5 Years to 65 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

A volunteer of any age with a diagnosis of EVD within the past 2 years who is on the Ministry of Health (MOH) Registry of EVD survivors is eligible to participate.

  • Willingness to participate in examinations at one of the participating health facilities
  • Willingness to provide informed consent/assent

Individuals on the MOH Registry were PCR positive for EVD and treated at an Ebola Treatment Unit (ETU), Community Care Center (CCC) or holding center. Periodically, participants enrolled will be matched against the MOH Registry to verify that those enrolled are EVD survivors. If a participant enrolled is not on the registry, their antibody levels at baseline will be assessed. If antibody levels are present, the participant will continue to be followed as an EVD survivor. If antibody levels are not present, the participants will no longer be followed as an EVD survivor and may be withdrawn from the study. Participants brought to the NIH Clinical Center will have documentation of positive Ebola virus PCR and a clinical syndrome compatible with acute EVD.


Any condition in the judgment of the study staff that would make the volunteer unable to participate in the study.

Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02431923

Contact: Michael C Sneller, M.D. (301) 496-0491 msneller@niaid.nih.gov

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike Recruiting
Bethesda, Maryland, United States, 20892
Contact: For more information at the NIH Clinical Center contact Patient Recruitment and Public Liaison Office (PRPL)    800-411-1222 ext TTY8664111010    prpl@mail.cc.nih.gov   
Monrovia Medical Unit ELWA-2 Hospital Recruiting
Monrovia, Liberia
Sponsors and Collaborators
National Institute of Allergy and Infectious Diseases (NIAID)
Principal Investigator: Michael C Sneller, M.D. National Institute of Allergy and Infectious Diseases (NIAID)
More Information

Additional Information:
Responsible Party: National Institute of Allergy and Infectious Diseases (NIAID)
ClinicalTrials.gov Identifier: NCT02431923     History of Changes
Other Study ID Numbers: 150122
First Posted: May 1, 2015    Key Record Dates
Last Update Posted: December 28, 2017
Last Verified: December 16, 2017

Keywords provided by National Institutes of Health Clinical Center (CC) ( National Institute of Allergy and Infectious Diseases (NIAID) ):
Household Contacts

Additional relevant MeSH terms:
Hemorrhagic Fever, Ebola
Virus Diseases
Hemorrhagic Fevers, Viral
RNA Virus Infections
Filoviridae Infections
Mononegavirales Infections