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 first vaccine against Haemophilus influenzae type b (Hib) disease was licensed in the United States in 1985. The HbPV polysaccharide vaccine was used until 1988. Porter W. Anderson, Jr, PhD, and David H. Smith, MD (1932-1999), had begun working in 1968 on extracting and purifying the polysaccharide outer coating of the bacteria.