when was the chickenpox vaccine introduced in the united states
Varicella vaccine The chickenpox vaccine first became commercially available in 1984.[2] It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system.[5] In the United States it costs between 100 and 200 USD.[6]
2009 flu pandemic vaccine The 2009 flu pandemic vaccines are the set of influenza vaccines that have been developed to protect against the pandemic H1N1/09 virus. These vaccines either contain inactivated (killed) influenza virus, or weakened live virus that cannot cause influenza. The killed vaccine is injected, while the live vaccine is given as an interperineal nasal spray. Both these types of vaccine are usually produced by growing the virus in chicken eggs. Around three billion doses will be produced annually, with delivery from November 2009.[1][2][needs update]