GENERIC NAME: hepatitis A vaccine. DRUG CLASS AND MECHANISM: Hepatitis A vaccine (Havrix, Vaqta) is used to prevent hepatitis A, a type of liver disease that is caused by the hepatitis A virus (HAV).epatitis A vaccine was approved in 2005. PRESCRIBED FOR: Hepatitis A vaccine is used to prevent hepatitis A. Hepatitis A vaccine can be used in persons 1 year of age and older. Although anyone can be infected with hepatitis A, certain people are at high risk and should be routinely vaccinated.
A deficiency is generally a lack of something. It may also refer to: 1  A deficient number, in mathematics, a number n for which Ï (n n. 2  Angular deficiency, in geometry, the difference between a sum of angles and the corresponding sum in a Euclidean plane.
(lÄk) n. 1. Deficiency or absence: Lack of funding brought the project to a halt. 2. A particular deficiency or absence: Owing to a lack of supporters, the reforms did not succeed. v. lacked, lackÂ·ing, lacks. v.tr. To be without or in need of: lacked the strength to lift the box.