The National Emerging Infectious Diseases Laboratories (NEIDL) is a state-of-the-art research facility that supports the work of investigators who focus on infectious diseases that are—or have the potential to become—major public health concerns. Our research program focuses on understanding how pathogens cause disease, and is dedicated to the development of diagnostics, vaccines, and treatments to combat these emerging and re-emerging infectious disease threats. The NEIDL houses biosafety level 2 (BSL-2), BSL-3, and BSL-4 laboratories, which are designed to permit investigators to work safely with these emerging pathogens. The NEIDL is owned and operated by Boston University, but is also one component of a national network of secure facilities that study emerging infectious diseases.