The experimental vaccine, mRNA-1273, is put to its biggest test as 30,000 American volunteers roll up their sleeves (pun intended) to randomly receive two doses of the vaccine or a placebo. The participants will be followed to see which group gets infected. If the vaccine passes the test, however, it will still be months before it can reach the general public.
Developed by the US National Institutes of Health and Moderna, mRNA-1273 early trial results showed that the vaccine boosted the immune system in ways expected to be protective. Some side effects, such as a brief fever, chills, and pain at the injection site, were seen. Results so far from Phase I and Phase II are as follows:
- Moderna has released a preliminary report detailing results from its phase I trial. The vaccine induced anti-SARS-CoV-2 immune responses in all participants, and despite some adverse events being recorded, there were no trial-limiting safety concerns identified.
View or Download (PDF) An mRNA Vaccine against SARS-CoV-2 — Preliminary Report
- Four people in the study of 45 experienced “Grade 3” adverse events. One of these was a low-dose recipient who developed rash at the injection site; the other three received the highest dose and had reactions “that involved their whole bodies.”
- The vaccine was not tested in animals prior to phase I beginning
Efficacy of mRNA-1273 against Upper and Lower Respiratory Viral Replication.
See full study.
The Phase 3 clinical trial will be conducted at U.S. clinical research sites, is expected to enroll approximately 30,000 adult volunteers who do not have COVID-19.
“Although face coverings, physical distancing and proper isolation and quarantine of infected individuals and contacts can help us mitigate SARS-CoV-2 spread, we urgently need a safe and effective preventive vaccine to ultimately control this pandemic,” said NIAID Director Anthony S. Fauci, M.D. “Results from early-stage clinical testing indicate the investigational mRNA-1273 vaccine is safe and immunogenic, supporting the initiation of a Phase 3 clinical trial. This scientifically rigorous, randomized, placebo-controlled trial is designed to determine if the vaccine can prevent COVID-19 and for how long such protection may last.”
Moderna is leading the trial as the regulatory sponsor and is providing the investigational vaccine for the trial. The Biomedical Advanced Research and Development Authority (BARDA) of the U.S. Department of Health and Human Services’ Office of the Assistant Secretary for Preparedness and Response and NIAID are providing funding support for the trial. The vaccine efficacy trial is the first to be implemented under Operation Warp Speed, a multi-agency collaboration led by HHS that aims to accelerate the development, manufacturing and distribution of medical countermeasures for COVID-19.
“Having a safe and effective vaccine distributed by the end of 2020 is a stretch goal, but it’s the right goal for the American people,” said NIH Director Francis S. Collins, M.D., Ph.D. “The launch of this Phase 3 trial in record time while maintaining the most stringent safety measures demonstrates American ingenuity at its best and what can be done when stakeholders come together with unassailable objectivity toward a common goal.”
The NIH Coronavirus Prevention Network (CoVPN)will participate in conducting the trial. The network brings together expertise from existing NIAID-supported clinical research networks. The mRNA-1273 vaccine candidate will be tested at approximately 89 clinical research sites in the United States, 24 of which are part of the CoVPN. Investigators will use public health data and incidence trajectory modeling to identify sustained high-incidence areas and emerging hot zones, so sites near these locations can be prioritized for enrollment.
NIAID scientists developed the stabilized SARS-CoV-2 spike immunogen (S-2P). SARS-CoV-2 is the virus that causes COVID-19; the spike protein on its surface facilitates entry into a cell. Moderna’s mRNA-1273 uses the mRNA (messenger RNA) delivery platform to encode for an S-2P immunogen. The investigational vaccine directs the body’s cells to express the spike protein to elicit a broad immune response. A Phase 1 clinical trial found the candidate vaccine to be safe, generally well-tolerated and able to induce antibodies with high levels of virus-neutralizing activity. Moderna initiated Phase 2 testing of the vaccine in May 2020.
Hana M. El Sahly, M.D., principal investigator of the NIAID-funded Infectious Diseases Clinical Research Consortium site at Baylor College of Medicine in Houston; Lindsey R. Baden, M.D., principal investigator of the NIAID-funded Harvard HIV Vaccine Clinical Trials Unit at Brigham and Women’s Hospital in Boston; and Brandon Essink, M.D., principal investigator and medical director of Meridian Clinical Research, will serve as co-principal investigators for the Phase 3 trial of mRNA-1273.
As part of the Accelerating COVID-19 Therapeutic Interventions and Vaccines (ACTIV) public-private partnership, NIH and other HHS agencies and government partners, in collaboration with representatives from academia, philanthropic organizations and numerous biopharmaceutical companies, advised on the trial protocol design and endpoints to ensure a harmonized approach across multiple vaccine efficacy trials.
The trial is designed to evaluate the safety of mRNA-1273 and to determine if the vaccine can prevent symptomatic COVID-19 after two doses. As secondary goals, the trial also aims to study whether the vaccine can prevent severe COVID-19 or laboratory-confirmed SARS-CoV-2 infection with or without disease symptoms. The trial also seeks to answer if the vaccine can prevent death caused by COVID-19 and whether just one dose can prevent symptomatic COVID-19, among other objectives.
Trial volunteers will receive two intramuscular injections approximately 28 days apart. Participants will be randomly assigned 1:1 to receive either two 100 microgram (mcg) injections of mRNA-1273 or two shots of a saline placebo. The trial is blinded, so the investigators and the participants will not know who is assigned to which group.
Volunteers must provide informed consent to participate in the trial. They will be asked to provide a nasopharyngeal swab and a blood sample at an initial screening visit and additional blood samples at specified time points after each vaccination and over the two years following the second vaccination. Scientists will examine blood samples in the laboratory to detect and quantify immune responses to SARS-CoV-2.
Investigators will closely monitor participant safety. They will call participants after each vaccination to discuss any symptoms and will provide participants with a diary to record symptoms and a thermometer for temperature readings.
If a participant is suspected to have COVID-19, the participant will be asked to provide a nasal swab for testing within 72 hours. If the test is positive for SARS-CoV-2 infection, the participant will be followed closely and referred for medical care if symptoms worsen. Participants will be asked to provide a daily assessment of symptoms through resolution and have saliva sampled periodically, so investigators can test for SARS-CoV-2 infection.
Study investigators will regularly review trial safety data. An independent data and safety monitoring board (DSMB) will review blinded and unblinded data—including safety data and cases of COVID-19 in both groups—at scheduled data review meetings.
Adults who are interested in joining this study can visit www.coronaviruspreventionnetwork.org or visit ClinicalTrials.gov and search identifier NCT04470427 to find a study center to volunteer. ClinicalTrials.gov includes a complete listing of study locations.
NIAID conducts and supports research—at NIH, throughout the United States, and worldwide—to study the causes of infectious and immune-mediated diseases, and to develop better means of preventing, diagnosing and treating these illnesses. News releases, fact sheets and other NIAID-related materials are available on the NIAID website.
VIDEO: How mRNA-1273 Works
For more information: “ COVID-19 vaccines: Summary of current state-of-play” (Prepared under urgency May 2020 – Updated July 2020 View or Download (PDF)