Shingles is caused by the varicella-zoster virus-the same virus that causes chickenpox. After recovery from chickenpox, the virus remains in the body and lies dormant in the central nervous system. Over half of all shingles cases occur in people over the age of 60, with the burden of illness twice as high in people over 70, compared to people aged 60-69 years old. 2  4,18. 3  Shingles in caused by the same virus that causes chickenpox-varicella-zoster virus.
The Federal Aviation Administration (FAA) of the United States is a national authority with powers to regulate all aspects of civil aviation.
Examples of these agencies include the Department of Energy (DOE) and the Internal Revenue Service (IRS), which is a bureau of the Department of the Treasury. Most federal agencies are created by Congress through statutes called  enabling acts  which define the scope of an agency's authority.