It's still unclear if the drug will work, and would be months away from potentially being available to the public, but the drug is now a contender to be the first vaccine of its kind ever approved to prevent an infectious disease.
More than 100 vaccines are being studied worldwide and with three human trials now underway in the U.S., Pfizer is testing four different versions of the vaccine.vaccine have been given to people in several states as part of a clinical trial to find a defense against a disease that has killed more than 70,000 Americans.
Unlike most vaccines in which an inactivated or otherwise safe version of the virus is injected into the patient, this experimental one relies on the body’s own genetic material. “It's a novel approach to vaccination,” said Dr. Mark Mulligan, director of the NYU Langone Vaccine Center, one of four sites chosen to lead the trial.President Donald Trump speaks with ABC News' David Muir in Phoenix on May 5, 2020.There are four candidate vaccines from Pfizer in a category known as messenger RNA vaccines. They’re based on ribonucleic acid, a form of genetic material that sends the body a message to produce a new protein.
The research program is long-term and will proceed in stages, starting with the months-long trial involving 360 healthy adults 18 to 55 years old in New York, Maryland and Ohio. Older adults will only be immunized with a vaccine candidate once testing in younger adults has provided initial evidence for safety and desired immune responses.
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