Speaker
Hana El Sahly, MD
Professor of Molecular Virology and Microbiology
Baylor College of Medicine
Topic
COVID-19 Vaccine Efficacy Studies: Challenges and Successes
Keywords
COVID-19; Vaccines; Clinical endpoints; Phase 3 trials
Key Points
- The design of Phase 3 clinical trials varies—from individual randomized clinical trials (RCTs) within sites, multiple arm trials within sites, parallel cluster RCTs, and stepped-wedge cluster RCTs—and each design produces different efficiencies and potential for evaluating the vaccine’s effectiveness.
- The primary endpoints of vaccine trials are infection, disease, and severe disease; however, a study with a primary endpoint that captures all the endpoints of public health importance is likely not feasible.
- A principle of clinical trials is that the study population should represent the vaccine target population. Yet, clinical trial participants traditionally are predominantly Caucasian, whereas COVID-19 disproportionately affects minorities, including a higher incidence and higher mortality.
Discussion Themes
Conducting effectiveness studies is essential to understanding how vaccines affect severe disease.
What are the arguments for or against human challenge trials?
Based on your experience during the past year, and the success of the COVID-19 vaccine trials, what applications do you see for future viruses outside a pandemic?
While some successes have been achieved, we do not know everything yet; it will be important to study other pathogens on other platforms to find approaches that ensure reliability.
Read more about Operation Warp Speed, a federal collaboration that has supported the acceleration of testing, supply, development, and distribution of COVID-19 vaccines, therapeutics, and diagnostics.
Tags
#pctGR, @Collaboratory1

