Hepatitis A Virus. 1  Overview: Hepatitis A is a liver infection caused by the hepatitis A virus (HAV). HAV was first identified in 1973 as an icosahedral, non-enveloped virus with a diameter between 27 nm (nanometres) and 32 nm (Figure 1). The virus is a member of the genus Hepatovirus and belongs to the Picornavirus clade.
New Passport Instructions. Applicants must complete the DS-11 application form. The signature line will need to be left blank until the acceptance agent instructs you to sign it. In this and in all other cases below, two copies of the letter of authorization will then need to be completed by hand and signed in black or blue ink.
How to Sign Your Passport Book. All U.S. citizens are required to have a valid passport to enter and exit the country. If you are planning to travel overseas and you want to travel by plane, you will need a passport book. If you only plan to travel by land or sea, you may consider a passport card.