hepatitis vaccine and covid

viral hepatitis is a world wide public heath concern with types A B and C being the most prevalent . Describe the current recommendedationd for hepatitis vaccines in the US. How do vaccines work in the body? Describe antigenes vs antibodies and active vs passive immunites. as pharmaceutical coorportions race to find a vaccine for covid-19 describe the provess by which vaccines are developed and tested. the information should be in your own words. Use two APA scholarly sources. 

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