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Researchers have developed not only a primary vaccine but also a booster to deliver HIV immunogens -- molecules that elicit an immune response -- via mRNA.

The hope is this process can induce specific white blood cells, called B cells, which can then turn into what are known as broadly neutralizing antibodies that can neutralize the virus.

According to the statement, Phase I of the trial will enroll 56 healthy, HIV-negative adult participants at GWU and three additional sites: Hope Clinic of Emory Vaccine Center in Atlanta; Fred Hutchinson Cancer Research Center in Seattle; and the University of Texas-Health Science Center at San Antonio.

Of the volunteers, 48 will receive one or two doses of the mRNA vaccine, and 32 also will receive the booster. The remaining eight will receive just the booster.

Researchers will then monitor for safety and efficacy of the new vaccine for up to six months after participants receive their final dose.

Moderna did not immediately respond to ABC News' request for comment.

ABC News' Sony Salzman contributed to this report.

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