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.
The first hearing aid using a vacuum tube was the âVactuphone,â invented by Hanson in 1920. It was produced by Western Electric Co., a leading producer of hearing aids, and distributed by Globe Phone Co. beginning in October 1921 (13).he first hearing aid using a vacuum tube was the âVactuphone,â invented by Hanson in 1920. It was produced by Western Electric Co., a leading producer of hearing aids, and distributed by Globe Phone Co. beginning in October 1921 (13).