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 produced by inserting a gene for HBV into yeast. The yeast is grown, harvested, and purified. The vaccine is given as an injection into the muscle.