Figure 3.
The percent rates of TB cases in the United States, Cameroon, Nigeria, and South Africa from 1993 to 2006 (US: United States, CAM: Cameroon, NIG: Nigeria and SOA: South Africa).
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.