the chicken pox vaccine became available in the united states in 1949.
the chicken pox vaccine became available in the united states in 1949.
when did the chicken pox vaccine become available in the united states?
1949
Na
Na
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