National Institute of Allergy and Infectious Diseases (NIAID) | 47,928 followers on LinkedIn. Join NIAID and make a difference! | This is the official LinkedIn account for the National Institute of Allergy and Infectious Diseases (NIAID). NIAID conducts and supports basic and applied research to better understand, treat, and ultimately prevent infectious, immunologic, and allergic diseases. For more than 60 years, NIAID research has led to new therapies, vaccines, diagnostic tests, and other technologies that have improved the health of millions of people in the United States and around the world.