An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Median 25(OH) D levels of TB cases and Household contacts (HHC) at recruitment. Median 25(OH) D levels at each month of recruitment for all participants are shown to reflect changes in levels of 25(OH) D levels.