successfully tested

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  • reno33

    Senior Member
    English - USA
    You are correct. (A vaccine that has had successful testing results) as implied in your above sentence means that the vaccine works (to cure the disease in question).
    Last edited:


    Senior Member
    English (UK then US)
    The aretcie explains:
    A vaccine developed by a British and Danish team was shown to be safe and effective during a randomized controlled trial ...
    Ir the vaccine had not been safe or effective it would not have been called a successful test :)


    Senior Member
    English - U.S.
    But, in contrast, it wouldn't be common to say it was unsuccessfully tested, even though the logic is the same.

    (A vaccine that has had unsuccessful testing results)

    We would pick different wording.

    “A chlamydia vaccine has been unsuccessfully tested in an early trial” :thumbsdown:

    “A chlamydia vaccine failed testing in an early trial”:thumbsup:
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