24+ Moderna Vaccine Trials Background. Pharmaceutical giant pfizer's coronavirus vaccine trial is also nearing completion. Pfizer's trial, which is not part of operation warp speed, has enrolled half the participants in both trials receive the study vaccine and half receive a placebo, and more than 25,000 of moderna's participants have already.

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The biotech firm's leading candidate has just entered phase three clinical trials in the u.s. For access to live and exclusive video from cnbc. Elle hardy participated in the moderna vaccine trial, and after experiencing side effects from the shot took an antibody test that came back positive.

That followed last week's news that pfizer inc (nyse.

The investigational vaccine was developed by the biotechnology company moderna and the national institute of allergy and infectious diseases, part of the national institutes of health. The trial involved 30,000 people in the us with half being given two doses of the vaccine, four weeks apart. Moderna is the second company to report preliminary results from a large trial testing a vaccine. Elle hardy participated in the moderna vaccine trial, and after experiencing side effects from the shot took an antibody test that came back positive.