“We need a lot of humility.” — Monica Gandhi, MD, MPH, of University of California San Francisco, discussing the many unknowns surrounding whether one dose of a COVID-19 vaccine provides sufficient protection for the previously infected.

“You either choose to live with it, or avoid anything that makes life meaningful.” — Alex Myers, DO, a doctor for the U.S. rugby team at the Olympics, describing the pandemic precautions being taken in Tokyo.

“It seems like an emoji wouldn’t be something that’s really that important to a health intervention.” — Gabriella Corrigan, of the Task Force for Global Health, on a new vaccine emoji to promote a more positive image of COVID vaccination.

“We’re only starting to put together pieces of this very important puzzle.” — Heather Snyder, PhD, of the Alzheimer’s Association, about the long-term effects of COVID-19 on the brain.

“No one has looked at the apparent best practice.” — Marvin Seppala, MD, of the Hazelden Betty Ford Foundation, on the need for better standardization in state nurse rehabilitation programs for substance use.

“Given that everything we do, we do through our brains, by monitoring our everyday actions we are essentially getting a continuous window into our brain function.” — Rhoda Au, PhD, of Boston University, about GPS devices that can identify people with early Alzheimer’s disease by their driving patterns.