Unlike the other vaccine candidates that require two doses, the Johnson & Johnson vaccine is a single-dose, which may make it easier to distribute.
Johnson & Johnson announced on Wednesday that its COVID-19 vaccine candidate has begun Phase 3 trials, joining Moderna, Pfzier and AstraZenca in large-scale clinical trials.
One benefit to a vaccine that can be fully administered in one dose is that people would not have to return in a few weeks. A technician sorts blood samples inside a lab for a COVID-19 vaccine study at the Research Centers of America in Hollywood, Florida, on August 13. Johnson & Johnson announced on Wednesday its vaccine candidate would enter Phase 3 clinical trials.Trials for the single-dose vaccine will begin immediately and include up to 60,000 participants across nearly 215 sites in Argentina, Brazil, Chile, Colombia, Mexico, Peru, South Africa and the United States.
The FDA has said a vaccine must be proven to protect at least 50 percent of participants in order to be considered effective.
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