Because of a lapse in government funding, the information on this
website may not be up to date, transactions submitted via the
website may not be processed, and the agency may not be able to
respond to inquiries until appropriations are enacted. The NIH
Clinical Center (the research hospital of NIH) is open. For more
details about its operating status, please visit
cc.nih.gov. Updates
regarding government operating status and resumption of normal
operations can be found at
opm.gov.
Indexers: Do not use; this heading is used as a Publication Type; for original report of the conduct or results of a specific human challenge trial; a different heading HUMAN CHALLENGE TRIALS AS TOPIC is used for general design, methodology, economics, etc. of human challenge trials
Scope Note
Trials in which participants are intentionally challenged (whether or not they have been vaccinated) with exposure to an infectious disease organism.