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Are you sure Oxford and AstraZeneca did not test for asymptomatic participants? My understanding is they tested a proportion weekly.

Edit: Nature mentions they did: https://www.nature.com/articles/d41586-020-03504-w

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Relevant section: The Oxford–AstraZeneca team is the only one of the three leading vaccine developers that monitored for asymptomatic infections, by collecting weekly swabs from some participants to determine whether they had the coronavirus but did not become ill.

My understanding is that they did test a subset of participants, but that the 62% figure doesn't figure in the asymptomatic cases. They've made it very confusing though, much like how they've explained the half-full dose results.

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