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.
n. A disease, such as rickets or scurvy, that is caused by a dietary deficiency of specific nutrients, especially a vitamin or mineral. The disease may stem from insufficient intake, digestion, absorption, or utilization of a nutrient.eficiency disease. n. 1. (Pathology) med any condition, such as pellagra, beriberi, or scurvy, produced by a lack of vitamins or other essential substances. Compare avitaminosis. 2. (Botany) botany any disease caused by lack of essential minerals.