Pfizer says its vaccine is proving to be safe during phase three trials.
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About 6,000 participants have complained of side effects, but all of those were minor and included headaches and sore arms.
Pfizer is studying more than 44,000 people of all ages. This in an increase from 30,000 that they announced on Saturday.
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The data they released on Tuesday shows that this decision was made because of the safety of the first phase of testing.
According to the study, "These results support selection of the BNT162b2 vaccine candidate for Phase 2/3 largescale safety and efficacy evaluation, currently underway."
The company expects to have data on the effectiveness of the vaccine in October.