the chicken pox vaccine was first licensed in the united states in 1984.
the chicken pox vaccine was first licensed in the united states in 1984.
when was the chicken pox vaccine first licensed in the united states?
1984
japan was among the first countries to vaccinate for chickenpox. the vaccine was first licensed in the united states in 1995. routine vaccination against varicella zoster virus is also performed in the united states, and the incidence of chickenpox has been dramatically reduced there (from 4 million cases per year in the pre-vaccine era to approximately 400,000 cases per year as of 2005). in europe most countries do not currently vaccinate against varicella, though the vaccine is gaining wider acceptance. australia, canada, and other countries have adopted recommendations for routine immunization of children and susceptible adults against chickenpox.
varicella vaccine
attenuated vaccine









































an attenuated vaccine is a vaccine created by reducing the virulence of a pathogen, but still keeping it viable (or "live"). attenuation takes an infectious agent and alters it so that it becomes harmless or less virulent. these vaccines contrast to those produced by "killing" the virus (inactivated vaccine).









































section::::examples.









































examples of "live" (example attenuated) vaccines include:









































bullet::::- viral: measles vaccine, mumps vaccine, rubella vaccine, live attenuated influenza vaccine (the seasonal flu nasal spray and the 2009 h1n1 flu nasal spray), chicken pox vaccine, smallpox vaccine, oral polio vaccine (sabin), rotavirus vaccine, and yellow fever vaccine.
attenuated vaccine