Cytomegalovirus (CMV) is a prevalent pathogen, with 40 to 100 percent of the general population showing prior exposure by serology.1 Up to 20 percent of children in the United States will have contracted CMV before puberty.
The concept of the Sousaphone was created by the American composer and bandmaster John Philip Sousa, putting it in a category with the Wagner tubaâa horn conceptualized by German composer Richard Wagnerâand the Saxophone, one of the numerous inventions of Belgian instrument maker Adolphe Sax.
No one really knows who invented the first hearing aid device. A study of the history of hearing aids will show that one of the first electric hearing aids was the Akoulathon. This was made by Miller Reese Hutchinson in 1898. Hutchinsonâs Invention.