2013 Legislation. Alaska: House Bill 21 - would have allowed for four-day school week pilots. This bill failed. California: Senate Bill 236 - would have allowed certain districts to pilot four day school weeks for high schools. This bill was passed and enacted.
Hepatitis B vaccine is a vaccine for the prevention of hepatitis B, an infection caused by the hepatitis B virus (HBV) . The vaccine contains one of the viral envelope proteins, hepatitis B surface antigen (HBsAg). It is produced by yeast cells, into which the genetic code for HBsAg has been inserted.
The hepatitis B vaccine is the best way to prevent infection. It is a series of 3 or 4 shots usually given over a 6-to-12 month period. It is given by an injection into the arm muscle of adolescents and adults and thigh muscle of infants and young children. All children should get their first dose at birth, and should have completed their vaccine series by 6-18 months of age. 2  Children and adolescents through 18 years of age who did not get the vaccine when they were younger should be vaccinated.