As millions are inoculated against the coronavirus, and the pandemic’s end finally seems to glimmer into view, scientists are envisioning what a post-vaccine world might look like — and what they see is comforting.

The coronavirus is here to stay, but once most adults are immune — following natural infection or vaccination — the virus will be no more of a threat than the common cold, according to a study published in the journal Science on Tuesday.

Growing up in the United States Virgin Islands, Dr. Marcella Nunez-Smith saw firsthand what can happen in a community with limited access to health care. Her father, Moleto “Bishop” Smith Sr., was only in his 40s when he suffered a debilitating stroke that left him partly paralyzed and with slurred speech.

The cause was high blood pressure, which could have been treated but had never been diagnosed. Without prompt access to advanced treatments, “the stroke was allowed to run its course,” Dr. Nunez-Smith, 45, recalled in a recent interview. Her father never fully recovered.