The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.
The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.
A group of people who share a particular characteristic, such as age or a medical condition. Participants for a clinical trial may be recruited from a particular cohort, such as pregnant women, children younger than 5 years old, or men with HIV.
