Clinical Studies

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Moderna’s mRNA-1273 vaccine, The COVE Study

The mRNA-1273 vaccine is being developed to prevent COVID-19. The purpose of this study is to test Moderna’s vaccine candidate to see if it can prevent illness if people are exposed to the SARS-CoV-2 virus in their everyday lives. The mRNA-1273 vaccine is not made from the SARS-CoV-2 virus. It is made from messenger ribonucleic acid (mRNA), a genetic code that tells cells how to make protein, which helps the body’s immune system make antibodies to fight the virus. The vaccine cannot cause infection or make someone sick with COVID-19.

Visit ClinicalTrials.gov and search identifier NCT04470427 for additional details.

This section will be updated as we have more information about additional studies. Please check back.


What Is a Clinical Study?

Interventions that have shown promise in the laboratory and then in animal models subsequently move on to research studies in people, also known as clinical studies. The COVID-19 Prevention Network (CoVPN) will be doing studies to find safe and effective vaccines and monoclonal antibodies for the severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2), which is the virus that causes coronavirus disease 2019 (COVID-19).

These vaccines and antibodies cannot cause SARS-CoV-2 infection or COVID-19 illness. They do not contain any live or killed virus. Participants in these studies may be exposed to the virus in their everyday lives, but they will not be exposed to the virus as part of the study (known as “challenge studies.”) These are studies of preventive vaccines that we hope will keep people healthy.

What Are the Different Stages of Clinical Studies to Test Preventive Vaccines and Antibodies Against COVID-19?

Clincal Trials Phase 1

Phase 1 Clinical Studies

Phase 1 studies test the safety of a product. This means seeing if there are side effects, and whether the human body can tolerate the vaccine or antibody. The experimental product is often compared to a group that receives a placebo, a substance such as sterile saltwater that has no active ingredients. These studies are conducted with a small group of people (usually less than 100) and typically last 12 to 18 months.

Clincal Trials Phase 2

Phase 2 Clinical Studies

Phase 2 studies look at questions such as the maximum tolerated dose, the optimal schedule for giving the product (how many doses, and at what time intervals), and whether the immune system is having the desired responses. These responses can include the production of antibodies, the production of T cells, and other immune system markers. These studies are conducted with a medium-size population of volunteers (usually a few hundred to 1000) and the studies can last up to 2 years.

Clincal Trials Phase 2b

Phase 2b Clinical Studies

Phase 2b studies are a way to get an early look at whether the product is effective at preventing infection or disease. They are sometimes known as Proof of Concept or Test of Concept studies. A group of several thousand people who are at increased risk for infection or disease are enrolled, and the studies can last about 2-5 years. Based on the data from these studies, researchers can see whether the results seem favorable, supporting moving ahead to Phase 3. If the results are less favorable, it means that researchers can redirect their efforts and save the expenses of large Phase 3 studies.

Clincal Trials Phase 3

Phase 3 Clinical Studies

Phase 3 studies are where researchers can ask the questions, “Does this product prevent new infections? Or if people do become infected, does the product help them control the infection so that it doesn’t become severe disease?” These studies involve many thousands of people, usually including some participants who are at increased risk for infection.

Clincal Trials Phase 4

Phase 4 Clinical Studies

Phase 4 studies may take place after a product has been found to be effective in some populations, and are utilized to gather additional information about safety and effectiveness by testing the product in additional populations such as children or pregnant women. They are sometimes known as bridging studies, or post-licensure studies. These studies may be conducted in anyone seeking a prevention option from their physician.

Interested in volunteering for a COVID-19 Prevention Clinical Study?

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