Staphylococcus aureus (. ) is a bacterium that commonly colonises human skin and mucosa without causing any problems. It can also cause disease, particularly if there is an opportunity for the bacteria to enter the body, for example through broken skin or a medical procedure.
Structure of Social Security Numbers. A Social Security Number (SSN) consists of nine digits, commonly written as three fields separated by hyphens: AAA-GG-SSSS. The first three-digit field is called the area number. The central, two-digit field is called the group number. The final, four-digit field is called the serial number.
Social Security numbers were first issued by the Social Security Administration in November 1935 as part of the New Deal Social Security program.he Social Security Administration does not reuse social security numbers. It has issued over 450 million since the start of the program, and at a use rate of about 5.5 million per year it says it has enough to last several generations without reuse or changing the number of digits.