Which groups have made huge strides in eradicating infectious disease?

The CDC, WHO.: The cdc, and the who are the centers for disease control and the world health organization respectively. These two organizations have done great work in eradicating diseases through vaccination and coordination of resources on a national and global effort. Diseases like small-pox are a thing of the past and others like polio and diptheria are easily handled. Those like cholera are kept at bay.