Renowned immunologist Miriam Merad, MD, PhD, center, and members of Mount Sinai’s Precision Immunology Institute created T-shirts that support COVID-19 vaccinations in honor of International Day of Immunology.

The significant role the human immune system has played in the spread and containment of the SARS-CoV-2 virus, which causes COVID-19, was the subject of an International Day of Immunology summit, held virtually on Thursday, April 29, 2021, and co-organized by pioneering immunologist Miriam Merad, MD, PhD, Director of the Precision Immunology Institute at the Icahn School of Medicine at Mount Sinai. Dr. Merad, who, in 2020, was elected to the National Academy of Sciences, also serves as Director of Mount Sinai’s Human Immune Monitoring Center.

Scores of prominent researchers from throughout the world gathered at the summit to celebrate the international collaboration that took place during the pandemic and the speed at which their work was translated into desperately needed treatments. Their deep understanding of the different ways in which the human immune system reacts to SARS-CoV-2 has helped guide the worldwide medical response.

Anthony S. Fauci, MD, Director of the National Institute of Allergy and Infectious Diseases, gave opening remarks. “As an immunologist, physician, and U.S. government official, who, for decades, has helped lead the public health response to emerging diseases, it has become clear to me the important role that immunology plays in medicine and in infectious diseases,” he told the audience.

“People with healthy, intact immune systems—such as most young people—can control SARS-CoV-2 infection by limiting its effects to the upper airways in mild symptoms,” Dr. Fauci said. “In contrast, older people or individuals whose immunity is compromised by immunosuppressive agents, or an immune-compromising illness such as cancer, are unlikely to produce a robust immune response that can keep SARS-CoV-2 in check. When the history of this COVID-19 pandemic is written, the discipline of immunology will stand out for its important role in explaining the remarkable protean manifestations of SARS-CoV-2 infection and in enabling us to identify and exploit vulnerabilities in the virus to develop safe and effective vaccines to thwart its pandemic spread.”

Florian Krammer, PhD

The summit’s participants also included Özlem Türecki, MD, Co-founder and Chief Medical Officer of BioNTech, the company that partnered with Pfizer to produce the first authorized mRNA vaccine and the first vaccine to fight COVID-19; and Florian Krammer, PhD, Mount Sinai Professor in Vaccinology at the Icahn School of Medicine at Mount Sinai, who created one of the world’s first antibody tests for SARS-CoV-2.

Dr. Türecki described the development of BioNTech’s mRNA vaccine for COVID-19, which the company dubbed “project light speed,” beginning in January 2020 as soon as virus’ genetic sequence became known. She said BioNTech’s early investment in mRNA technology allowed the company to move quickly, particularly when their scientists expected the pandemic to spread “even faster” than it ultimately did.

BioNTech created 20 vaccine candidates at first, and then pared them down to four. By July, the company selected its “pivotal candidate” for phase 3 efficacy testing. In November, the vaccine was found to be 95 percent effective, and in December, the United States began administering the vaccine under the Food and Drug Administration’s Emergency Use Authorization.

According to Dr. Türecki, BioNTech was able to reach the market quickly by perfecting its manufacturing process at the same time it developed the vaccine. The Pfizer-BioNTech vaccine has now been authorized in more than 65 countries and administered to more than 260 million people.

Dr. Krammer said that eventually, scientists will “disentangle” the many questions that still remain about SARS-CoV-2 and the adaptive human immune system. For example, will people have long lasting immunity? He also questioned whether it would be advantageous to receive two different COVID-19 vaccines rather than the same one twice.

“But there’s a more pragmatic question here,” he said. “We are in a situation right now where we don’t have enough vaccines, and the production rate of the vaccines that are currently produced and licensed is not high enough to cover the globe and a lot of countries are struggling to get access to vaccines.” Improving the situation is critical.

Indeed, Ester C. Sabino, PhD, Professor, Institute of Tropical Medicine, at the University of São Paulo, Brazil, said, “If we don’t have access to vaccines, then probably herd immunity will never be reached.”

Panelist Adrian Hill, DPhil, Director of the Jenner Institute at Oxford University in England, and a co-developer of the AstraZeneca vaccine for COVID-19, concurred. “The biggest failing in responding to COVID-19 has not been in vaccine technology—they perform really well. And it hasn’t been in the speed of response—that’s been extraordinary,” he said. “It’s been in the lack of physical locations that manufacture vaccines widely around the world. We need to have facilities that can flip overnight to make outbreak pathogen vaccines.”