Most hepatitis a vaccines contain inactivated virus while a few contain weakened virus. The ones with weakened virus are not recommended during pregnancy or in those with poor immune function. Hepa vaccines are prepared from formalin-inactivated, cell cultureâ€derived hepatitis a virus.

The combined hepa/hepb vaccine is also … Hepatitis a is a disease of the liver caused by the highly contagious hepatitis a virus. Even in very small amounts, the virus can spread when ingested †usually through person-to-person contact or by eating …

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