ABC News is reporting that the CEOs of vaccine-makers Pfizer and Moderna joined cardinals, academics and the lead guitarist of Aerosmith in opening a unique Vatican conference on COVID-19, other global health threats and how science, solidarity and spirituality can address them.

The three-day online conference, which began Thursday and ends Saturday with a virtual audience with Pope Francis, was planned well before the pandemic erupted last year.

Organizers said the event has only taken on more relevance amid a growing appreciation of the need for global access to health care, new advances in vaccine technology and greater understanding of the mental health cost of loneliness.

Dr. Anthony Fauci, the immunologist who leads the U.S. pandemic response, opened the meeting by saying the pandemic had confirmed to him that faith and science are constantly evolving - and that scientists in particular must humbly admit they don’t have all the answers all the time.

One answer the director of the U.S. National Institute of Allergy and Infectious Diseases said he did have was that the key to overcoming current vaccine hesitancy is pairing the right medical message with the right messenger.

“You have someone who’s a deeply religious person who will listen to their clergy. That’s different than me with a suit going into an area telling people to do something,” he said.

Fauci was referring to the religiously inspired resistance to taking COVID-19 vaccines that were indirectly developed using lines of cells derived from aborted fetuses. The Vatican has declared that all COVID-19 vaccines are not only morally licit, but that people have a moral responsibility to get the jabs to protect others.

The multidisciplinary conference was originally scheduled to take place at the Vatican in May 2020 but was postponed a year and eventually put online due to the pandemic.

The virtual format, however, has allowed for an even greater variety of participants.

A Harvard neuroscientist is leading a conversation about brain health and rock stars with Aerosmith guitarist Joe Perry. Soprano Rene Fleming is participating in a panel discussion on the role of music in treating cardiac patients. Supermodel Cindy Crawford has a slot to talk about “beauty from the inside out,” and Chelsea Clinton is teaming up with an Italian public health official to promote equal access to health care.

Read more at ABC News.