Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock ( A locked padlock ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
![Chinese Public Health Posters](https://cdn-ak-scissors.b.st-hatena.com/image/square/556ffba4f4346152abaec25215f18e76dd73b00c/height=288;version=1;width=512/https%3A%2F%2Fwww.nlm.nih.gov%2Fimages%2FNLMgeneric.jpg)