Since: 1995 in the us , and 1988 in japan.
Answered 4/26/2016
5.8k views
Depends: We could get it on special approval from the CDC in the 80's for kids with cancer who might die if exposed/infected. The FDA held up approval of the vaccine for years until (in 1995) they found enough data to support the cost/benefit of approving and recommending the vaccine.When it came out it had the highest unit cost of routine vaccines.
Answered 8/20/2016
1k views
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