美国的什么部门研究疫苗，病毒抗体以及环境保护

United States Environmental Protection Agency（美国环境保护局）
The U.S. Environmental Protection Agency (EPA or sometimes USEPA) is an agency of the federal government of the United States charged with protecting human health and with safeguarding the natural environment: air, water, and land. The EPA began operation on December 2, 1970, when it was established by President Richard Nixon, and has since been chiefly responsible for the environmental policy of the United States. It is led by its Administrator, who is appointed by the President of the United States. The EPA is not a Cabinet agency, but the Administrator is normally given cabinet rank. The current Administrator (as of 2007) is Stephen L. Johnson, and the current Deputy Administrator is Marcus Peacock. The agency has approximately 18,000 full-time employees.
U.S. National Institutes of Health（美国国立卫生研究院）
The National Institutes of Health (NIH) is an agency of the United States Department of Health and Human Service