>>11929882Because no one actually thought of running challenge trials on 1,000 strong cohorts of soldier volunteers for the top 20 candidates back in April. Scientists are not very smart like that.
>>11931541>>11932242Correction: no there hasn't been one but not for technical reasons. There's just no market for something that prevents maybe half a cold per year per person. And that's if you had a vaccine against *all* pre-COVID strains.
