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Discussion » Statements » Rosie's Corner » What other vaccines have required TWO DOSES to be effective? Why does the COVID 19 vaccines so far(one exception) require TWO?
RosieG

What other vaccines have required TWO DOSES to be effective? Why does the COVID 19 vaccines so far(one exception) require TWO?

Johnson & Johnson are one dose. Perhaps other vaccines are being developed that are also one shot.

Posted - March 22, 2021
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