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Traditionally, efficacy trials randomly assign participants to receive the vaccine or a dummy shot.
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Dummy shots of intruders are randomly inserted in the images to make sure spotters are not asleep at the switch, and the images they see are selected from thousands of different sites around the country, so no one knows for sure where the site that he or she is observing is located.
The virus infected 105 people who received the dummy shots.
The drug manufacturer Merck and academic researchers said they would "unblind" the study of an experimental AIDS vaccine that may have actually raised the risk of infection, telling thousands of people who volunteered whether they got the actual shot or a dummy injection.
But at the meeting, Ripley Ballou from GlaxoSmithKline (GSK), which has the Ebola vaccine furthest in development, won wide support for his argument that the fastest, most ethical way to assess whether the product works is with an RCT that uses an "active control"—such as a proven vaccine against an unrelated disease rather than a dummy placebo shot.
Goalkeepers should be wary of dummying, lob shots and skip or bounce shots.
The only way to get round his inability to carry either was to use dummies, trick shots and wires.
Kroos again, leads to Gomez dummy on a shot at the top of the goal box, for naught.
Wiltord slipped the ball to the midfielder who, with Desailly and his fellow defenders backing off, threw them a dummy before producing a shot from just beyond the arc that Cudicini could only help into the top right-hand corner of the net.
Netanyahu's position currently resembles that of a dangling dummy on a shooting range where critics and enemies queue up to take a pot shot.
Defense officials said the Arrow II shot down a dummy missile.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com