WASHINGTON — Elizabeth Graves, an ardent supporter of President Trump, is not opposed to vaccines. She said she had taken flu shots and pneumonia shots and, having just turned 50, was interested in being vaccinated against shingles.

But Ms. Graves, a legal transcriptionist in Starkville, Miss., said she would not be taking a coronavirus vaccine — and the sight of Vice President Mike Pence rolling up his sleeve to get vaccinated on live television on Friday, she added, would not change her mind.

The largest burden of Covid-19 has undoubtedly fallen on people older than 65; they account for around 80 percent of deaths in the United States. But if we momentarily eclipse that from our mind’s eye, something else becomes visible: The corona of this virus.