1 Visa - Digits two through six are the bank number, digits seven through 12 or seven through 15 are the account number and digit 13 or 16 is a check digit.  MasterCard - Digits two and three, two through four, two through five or two through six are the bank number (depending on whether digit two is a 1, 2, 3 or other). The digits after the bank number up through digit 15 are the account number, and digit 16 is a check digit.
AIDS is the acronym for acquired immunodeficiency syndrome. 1  It is the stage of HIV infection where a person's immune system is fully compromised, leaving the body open to a wide range of potentially deadly diseases known as opportunistic infections.
HIV (human immunodeficiency virus) is a contagious, deadly virus that is spread through blood, blood products, and other body fluids, such as semen. Early symptoms of HIV infection include cough, body aches, headaches, nasal congestion, sore throat, and cough. Some people have no early symptoms at all and may appear healthy. However, untreated HIV infection is connected to many diseases, including heart disease, kidney disease, liver disease, and cancer. HIV infection can lead to AIDS (acquired immune deficiency syndrome).